Cashback compliant

I wouldn't recommend this and it seems the requirements of working for this company is to be a criminal, I'm being robbed and I feel so stupid at times, I brought a faulty car last year 1st of July and it didn't even finish a year, I was charged R4000 installment for 5 years for a faulty 2013 polo 1.6 and a cashback of R500 each months was promised and yes I must say I got it but the agreement was for it to pop into my acc until August this year but now it has stopped. The dealer who assisted me isn't longer working there and I'm struggling to find someone that can assist me. There are lot of things that I'm not happy with but for now my R500 cashback would do me good. Thank you