Ford fiesta 2017

Can you please help me with gearbox mobile 14 Chadwick ave,wynberg.I took my car there ford fiesta 2017 for the gearbox repair(clutch).And three weeks later they still haven't fixed my car and I don't owe them any money.When u call them its either they don't answer the phone or the phone is on voice-mail.I am not happy with their service as the showed to be unreliable and ****s.