SMD silent treatment

I purchased a vehicle from this company, paid a tow rruck and did a few repairs on the car to get it to run smoothly. Once all was done we tgen realised the engine number had been grined off, i called and was told to return the car. Jired yet another tow truck to bring the car back to Sandton in August as i could not risk driving a car with no engine number. I looked everywhere for the registration docs of which tgey had given me but i couldn't find them. Was told to do an affidavit which I did and submitted on the 3rd of September to date i haven't heard any response regarding my refund. They say i need to pay R1500 to replace the papers of which i was ok with but no obe has bothered to send me an invoice. In a nutshell they have sat with my money for 6 months and have earned great interest on it, i their customer doesn't have a car because i need to pay R1500 to be refunded my R50k of which could be deducted from my balance or even better i still have the R5k that i put in to bid. This is pure disrespect We were taught that the customers make up a big chunk of our business but with smd it looks like once the sale is done you are on your own. Even the 1 star, i dont think you deserve it as this is poor service at its best.. Disgusted