Business ProfileforKNB Motors Inc

On 10/12/23 I bought used '16 Audi A4 ****** mi from KNB Motors. Website & ************* me 90 day warranty. Website states select vehicles come with a FREE 90 day ***** mile warranty... 2012 or newer, must have less than 150k miles, not applicable to any semi trucks, nor *********** VNL trucks. The way this is written, it descriptively states the two credentials, and which vehicles are not applicable. KNB had me sign contract w/wording sounding like voided warranty, so KNB assured me that I still have 90 day warranty.On night of purchase, check-engine light lit up on the way home. I called KNB & spoke w/Sales Mgr **** who instructed me to stop at parts store to run code. I have docs to prove. Autozone's print-out read catalytic converter needed. I called **** again who said go to local mechanic (bc I live 2 hr away) so I went to ********************* ********** who charged $258 diagnostic which matched free reading that Autozone. KNB assured me they would reimburse $258 but didn'*********** assured me they will pay for replacement generic parts & labor for catalytic converter costs: $2,171 but I never received payment.KNB Motors owes me total of $2,429 for parts/labor/diagnostic fee.**** has even give me someone's debit card and mailing address via text which I still have (stating that it's his wife's card and their home address) to use as payment for the mechanic. I then had the mechanic run the card through several times only when prompted by ****, and all transactions came back declined due to insufficent funds. I'm not 100% sure if this is even his wife's card. Why would she or he be attempting to pay this when KNB is obligated?Please help me, what happened to me isn't right or no way fair. I trusted them to take care of this and they haven't made any real attempt. I could of gone anywhere to buy a car but I chose them and this is how they take care of their me and their product.