Vehicle Services Department Every 2-3 months I receive a letter about my 2013 Ford Explorer warranty, states I must get a contract from them Plano Texas

Every 2-3 months I receive a letter from Vehicle Services Department, stating my 2013 Ford Explorer warranty has expired and that I MUST purchase an extended warranty from this company. I have called several times to request stopping these letters and annoying phone calls. I requested they take my name off their contact list. BUT they continue to harass me with warnings about major repairs that will cost me a lot of money.

Please inform this company that I am not interested in purchasing an extended warranty plan from them, as IZ have Ford Extended Service Plan 5 years or 75,000 miles, purchased from my Ford dealer.