A service contract is a long promise, and it only works while the company can find you, match you to the car, and read the odometer you report. Many problems in the middle of a contract come from stale details rather than from the car itself. Build a habit of checking the details on file whenever something in your life changes.
Your address and contact details
Update your mailing address, phone number, and email with the administrator in writing as soon as they change. Keep proof that you sent the change. If the company sends a renewal or cancellation notice to an old address and the contract requires written delivery, that notice may still be treated as delivered, which is a good reason to fix the address promptly.
The lienholder
If a lender is named on the contract, tell the company when the loan is paid off and ask for the lender's release or payoff confirmation. A contract that still shows a lender after the loan has ended can cause delays in refunds and claims. Ask the company what it needs to change the lienholder entry, and keep the confirmation with your copy.
The odometer
Some contracts ask for mileage at certain points or use mileage as evidence of how the car was cared for. Write down the odometer reading whenever you have the car serviced and keep it with your records. If the contract asks for a reading, supply the reading you can prove, not an estimate.
A one-page contract sheet
Keep one page with the contract number, the provider's claims phone and mailing address, the administrator's name, the expiration line from your copy, and the names of anyone authorized to speak for the contract. Update the page whenever a detail changes. When you need the contract, the sheet saves time and lowers the chance that a notice goes to the wrong place.