13 Pro Max Cable Burnt'Melted from near the phone end on the very 1st use.

I switched from 12 pro max to 13 pro max. Activated the phone and transfered all the data to 13 pro max. The phone had around 25% battery by then, took out the cable and put it into charging for the 1st time after buying it (Keeping in mind it was a box packed phone). After some time I started observing some burn't or melted plastic smell from the phone. When tried to Unplugged the phone, the cord was almost melted near the phone end and was so hot that I feared that I might break the cable and burn my hand so I just took the adapter out of socket to cool it down. Surprisingly the adapter wasn't overheated at all, neither the cable was near the adapter end. After a while I took out the cable from phone, it was still pretty much warm. I never had this issue with 12 Pro Max, the charging speed was great. Charged 13 pro max with the same adapter and the cable that came with the box of 13 pro max. My phone got to 70% charging, haven't charged it since then. What shall I do next?