POOR WORKMANSHIP POOR SERVICE

I have been taking my vehicle dor a service ro Hyundai Springfield Durban... I have been having endless problems with a noise thats buzzing on my driver side seat belt after it was changed by the dealership Hyundai Springfield... I have sent my vehicle numerous times to have it resolved however to no avail... I have sent numerous messages ALL PROMISES & NO SHOW!!! I have tried contacting the dealership from person to person the line is transfered and no further communication... which is highly frustrating... I have never had this issue until they had changed this ... the manager does not contact you to further check if the service received was delivered