Almost 6 months without parts ordered & 2 weeks without my refund

On the 30th November 2018 I took my wife's car Citroen DS3 in for a service. I was then informed that, solenoid valve & oil gauge needs to replaced. I then paid the full amount for both parts to be ordered plus I also paid labour. I was calling them almost twice a month to check whether the parts has arrived/not, and they promise to give me a call which they never did. On the 10th of May 2019, I then went to the branch only to be informed that, my order was not placed. I then requested them to cancel the order & refund me, until today I haven't received my money back. Please people of SA, don't buy Citroen due to their terrible customer service plus car parts are not available.