Many contracts send the repair to a shop on an approved list. That list is a working arrangement, and it can change without much notice to the household. The early signs appear in routine contact long before a claim is refused, so it helps to know what to listen for.
The signs to catch early
A shop on the list says it no longer takes the contract. A phone number on the list goes to a general desk that cannot confirm the network. The list on the website differs from the list you were given. A shop asks you to pay up front and says reimbursement will follow, which is not how the approved route is described in the paper. The seller asks you to find a shop yourself without saying whether it will be accepted. Each sign is worth writing down the day it happens.
Keep a simple log
Each time you call a shop or the seller about the contract, write the date, the name of the person you spoke with, the shop named, and the answer in one line. Keep the log with the signed page. A pattern of short, vague answers over several weeks is a record you can show the seller and the regulator if the network is in doubt.
Ask for the list in writing
Request the current approved list from the seller, in writing, and compare it with the list you were given at signing. Check whether the list names a shop near your home. Read the contract to see who chooses the shop, whether the holder may pick a shop outside the list, and what approval steps are needed before work starts. This guide has not read every seller's network terms, so the wording in your own document decides these points.
What to do when the list fails
If the approved shops cannot be reached, ask the seller in writing which route applies. Ask for the name of a person who can approve a shop outside the list. If the answers do not resolve the matter, the state's regulator is the next step, and the state page on this site names that regulator and the statute it administers.