problem

Im really unhappy with the service I have been receiving from Hyundai Boksburg service department, since I bought the car i20 in 2020 had a problem with USB pod at 1st they took out radio for 2 days and was told it was fixed again after few weeks same thing happened, was told to bring it back again my time and petrol was told again its now fine after another few same thing happened sat there for hours and ended up not going to work bcos of them and was told it was connection of wiring again till today having a same problem, car and radio still on warranty but they don't want to replace it please help Peter