[RamaGLA]

Welcome. Looks like someone drove their dog around, if that was a child it needs therapy.

Glad you emailed the dealer, hopefully they’re stand-up people and will pay or subsidize the repair/replacement cost. In all honesty, they’re really not responsible unless they deliberately hid the damage. If the listing is still online, see if any photos were edited/low res, that could be used as proof of deception should you need to arbitrate. Make sure there was no mention of damage on the listing or any written correspondence (texts, emails, etc.) or the documents they gave you/made you sign

As a purchaser, it’s your responsibility to inspect the vehicle before purchasing. Maybe a court would rule in your favour if they intentionally deceived you, but that’s a long, expensive process and difficult to prove. If it’s a reputable dealer, they may repair or replace the panels to protect their reputation or gain customer loyalty, but that’s a gamble.

Look for reputable vehicle upholstery repair shops in your area, they will likely be able to fix it for a fraction of the replacement cost. This is likely what the dealer will do if they agree to fix it. Check eBay, etc. to find used door panels.

also inspect the seat backs, rear seats, headrests, console, headliner and boot for any further damage that they may be liable to disclose. In the future, do a more thorough inspection or get a professional opinion before purchasing.

 

[RamaGLA]

To better answer your actual question, the cost of replacement will vary depending on what components need to be replaced and purchase location. New parts will come at a more individual level (arm rest is a separate piece, trims, speaker grilles, handles, panel sections, door pockets, etc.) so you’ll need to figure out what exactly needs replacing. Then the door panel has to be taken apart, reassembled and installed. It won’t be cheap.
Can’t recommend any particular shop as I’m not from the UK, but see what RJ Automotive can do. They usually have parts prices lower than dealers.

 

[RamaGLA]

Thanks for your reply, unfortunately they didn’t help in the end and just said it should of been spotted before committing to the car. So I will look into sourcing some new ones or good second hand ones. New from Mercedes won’t be cheap so will see. They were not a main dealer but a back street car dealer.

are you the same person? your OP was from a different account. Did you check the photos or listing to see for any coverups? I'd strongly suggest getting a repair rather than replacement, it will be cheaper, quicker, easier and avoids having to match trims/colours. It's also far less wasteful and you'll avoid any rattling/misalignment from removing the door panels.
makes sense to me to spend as little money as possible since this is an aesthetic repair, not a functional one.