Faulty iPad Pro replacement

None of the iPad Pro models have transitioned to Apple’s list of obsolete devices - and as such, service and repair remains available for all models. The first generation iPad Pro is listed as “vintage” - and as such repair and battery service continue to be supported while parts remain available.

Obtaining service for your Apple product after an expired warranty - Apple Support

As such, the information that you have reportedly received may not be accurate.

You might be best advised to visit the Genius Bar at you local Apple Store or Apple Authorised Service Provider (AASP), where Apple’s technicians will be able to help:

Genius Bar Reservation and Apple Support Options - Apple

What year is your device? Here is info from Apple:

Obtaining service for your Apple product after an expired warranty - Apple Support

There isn't much you can do - I would not trust a third party repair place.