2018 DYNAMAX ISATA Seat Belts Problems

VEHICLE IS A 2018 MERCEDES BENZ SPRINTER-BASED 24 FT MOTORHOME. IT WAS STATIONARY WITH ENGINE OFF. WHEN ROTATING THE DRIVER'S SWIVEL SEAT 180 DEGREES (WHICH IT IS DESIGNED TO DO), UNDERSEAT WIRING WAS SEVERED DUE TO IMPROPER WIRE ROUTING BY THE "UPFITTER" (DYNAMAX CORP), THUS CAUSING AN INSTRUMENT PANEL WARNING OF "SRS FAULT; PROCEED IMMEDIATELY TO REPAIR FACILITY". THIS ANALYSIS WAS MADE BY MERCEDES BENZ OF KANSAS CITY SERVICE DEPARTMENT WHERE A REPAIR WAS PERFORMED. MERCEDES BENZ REFUSED COVERAGE UNDER THE CHASSIS WARRANTY SO I PAID THE REPAIR COST OUT OF POCKET ($388.90). I SUBSEQUENTLY WROTE A LETTER TO DYNAMAX REQUESTING REIMBURSEMENT. SEE ATTACHED PDF INCLUDING MB SERVICE INVOICE AND PAYMENT RECEIPT. I RECEIVED NO RESPONSE FROM DYNAMAX FOR TWO MONTHS. UPON FOLLOWING UP WITH DYNAMAX BY PHONE ON 7/8/2019, I WAS TOLD THE REIMBURSEMENT REQUEST WAS DENIED BECAUSE I WAS NOT THE ORIGINAL PURCHASER OF THE VEHICLE AND THEREFORE...