Bad experience with TLC auto services

Brought a vehicle on 3rd May 2018 at TLC auto services in Wynburg in a space of 4 days the vehicle needs service to my suprise it was last serviced in February 2017, and it needs brake pads and discs (wheels) in space of 16 days i noticed the car was mixing oil and water in all those incidents i report to the dealer telephonically the answer was we did sell the car to you at a special price, with last incident they said am must bring the car in for them to look what the problem could be, got there instructed to drop it GMW motor services by the dealer for further diagnosis on the 22May. On the 31May TLC fowarded me a quatation of 14,794.99 demanding me to pay 50% of that or they will buy the parts that are needed and i must pay for labour of 5,320 i refused to pay anything as i own that car 2 wks the owner of TLC started to accuse me of breaking the car, driving it over 1000km and not taking the warrant immediately i ask them to repair the car or give or take it back since then i never had from them till the 3rd July when they requesting me if they can send the invoice to me because the vehicle is repaired and is back with them my responce was they can forward the invoice but am not paying anything they never emailed it to me i call them on the 4July to see if they have emailed the invoice responce was no the boss said i will run with the invoice to the lawyers and i cannot get the car back if am not giving money for part of repairs. It was my first vehicle i had a bad experience and since then got sleepless nights.