ipad restrictions wont work

No I asked how secure they were told them my needs for them aka education as they have no school and for games etc when out I told them that due to issues with my eldest and things we'd had happen I needed them to be completely locked down they told me they would be only reason I bought them on buying them they told me that they could not set up for the kids as not old enough and would need an adult profile fine use mine but they said that I could restrict them fine it's what I wanted then they started trying to sell me a third device at this point my kids are tearing at my sleeves and running around the shop I told them no I did not wish to purchase anything else that almost 3k was more than enough I just wanted help setting them up as I'd never had one in turn they went back in four times due to finding stuff they shouldn't have had and told each time they were fine. I've tried to keep watching but my eldest has been a nightmare we've all been very unwell with covid twice and I did lapse then yesterday one of my sons was doing video's and I discovered he had uploaded them to tiktok which I removed straight away but on further investigation realising even the main account profile was wide open apps that are meant to be hidden are visible stuff they shouldn't be able to access nor see was visible after six hours on the phone the tech told me that in all likelihood that the reason they are not working is because my account is on them not a child account to actually fully secure I need a third device which I refuse point blank to buy I do not want nor need another device I'm quite happy with the phone I have! Six hours of going through everything only to pick the tablet back up and switch the screen on to see it and done exactly the same thing again showing items that should be locked down giving access to things that again show locked down. Apps I'd removed or hidden back on the tablets. Three phones calls and now all I'm told is they won't be secure as my name's on it I cannot do family share as they were bought for the kids not myself and I cannot and will not spend money I do not have to buy a device just to make these flipping things work! I feel like I've been completely mis sold them solely to get the money! And no consideration given as to what I was actually looking for and need for the kids! And to add my family once bought my daughter (now and adult) a tablet and she was a disaster on it wed connect to email she'd change the emails we tried to monitor she'd move somewhere else she ended up putting our information on the dark web she ended up being a victim of fraud and we had not only the police but social services at the door I told them all this I told them we needed something we fully controlled and we have not been sold that which is very clear considering we are now all over tiktok!! Which I am now trying to get sorted out. But as we've had them a few months I've no idea on where we stand going in to the shop which we are doing this week and kids will not be getting them back till we've gotten answers!

So the store lied to me then when they sold me the devices? They knew I didn't have another apple device because they asked me that! When they told me they would be fine and work like that it was a load of rubbish.

I cannot and will not justify buying a third device of any kind just to get the

two to work. Thank you for clarifying this I will make sure they see this response when I go in to the store on Thursday.