Incredibly poor communication and customer relations

I have had not one, but two unsatisfactory experiences with this company. Firstly, they came to do a service and clutch kit replacement on the 19th of March with assurances that the clutch was fixed and the car would drive perfectly. Two days later, and the car's clutch was still giving issues which lead to the mechanics returning and stating that the clutch cable needed to be replaced at an additional expense (something which was not picked up on the initial service and clutch kit repair).

Fast forward 3 months and my car breaks down with plumes of white smoke coming from the bonnet and a severe oil leak - after an inspection from an independent mechanic, the diagnosis proved to be that the oil had been overfilled with the initial service (so severely that despite the oil leak, there is still excess oil above the maximum fill line), and due to this the front cam seal had broken due to excess pressure building up in the engine. To date I have had 2 phone calls with different employees (both times stating they needed to confer with the mechanic), 7 unanswered phone calls and two unanswered emails - all whilst my car sits unusable, and I have to make alternative transport arrangements at my own expense. I have however received a laughable promotional email offering R50 discount towards my car repairs.