No assistance from the sales exec

I bought a i20 glide and from day one had tires that had bubbles when it was sold to me and i raised the issue i was told that the tires are fine like that and i should not worry .I paniced as i was driving to cpt and eventually i was sent to edenvale service centre to get tires and they fit tires not the same and that was in 12/18/2014 and i drove to capetown 12/20/2014. The lisence disk expired in 01/2015 and told him about the disk age and he said on the 01/23/2015 that i should send a proof of address of where i was living in midrand at my fiances house as well as an affidavit from fiance saying that i reside him with as well as his id copy certified.sent all the paper work 4days later day to clive and he acknowledged receipt of docs.i followed up with him and he told me that the documents came late, and that i should now give him R600 to do the licence disc and the roadworthy as it has expired. That was suppose to be two weeks ago and till this day i have not recieved the roadworthy docs nor the disc, he says its not up to him so its out of his hands. i now cannot duse the car, scared to be stopped and arrested on the road. i contstantly have to call him for feedback. Help