From being fantastic service to turning into terrible

Good day When buying the the car ,it was a awesome experience thought we made the right choice and salesman was helpful and we were quick ,promised everything was checked and will do bmw 101 check shouldnt stress.firstly i had pay the bmw check a list of problems with car so wasnt checked like promised,serviced even further when more when they took car fixed and replaced parts but then damaged my rims ,i asked for all invoices, still waiting ,and no salesman ,and no follow up bmw 101 which im gona probably pay for ,from such a excellent service at the start to terrible at end