Promised to be paid back for a new tyre but not.

I purchased a car last August from Hyundai Midrand, firstly when I took the car for it's 1st service, when I was called to collect the car I walked in to find my car in the workshop up in the air with the gearbox out ( they took the wrong car- I should have known then), so I had to wait over an hour while they put my car back together again. Now, I had a flat tyre, went to a garage to get my spare out the boot- the spare tyre was punctured and the rim was damaged so I couldn't use it. I called Enos at the Midrand branch, he told us to go to Mintys and get it replaced and bring him the invoice and that he promised it would be paid back to us ( he even met my fiance Gary at Mintys while they were putting a new tyre on. We have paid for this tyre and we are still waiting to be reimbursed by Theo who told ushe would take care of it for us but we now find out he has resigned without sorting our problem out. This is ridiculous service! I thought Hyundai was supposed to be a top company but with this being my 1st time buying a Hyundai this is very disappointing!!