Mercedes Benz Sandton the worst after sales support

Took my vehicle in after a breakdown to Sandton dealership. Was told that key and ignition was faulty after inspection. Ordered a new key and replacement ignition. Paid for the new key. Vehicle sat at dealership for 2 months 22 days. Turned out that new key was not even ordered after such period after which i canceled the order for the new key and collected the vehicle. Deal Advisor never provided updates and if i didn't call them and go to dealership then they would not have even advised of the issue with ordering of key. To make matters worse, Mercedes have still not refunded the R5500 paid for the new key despite cancellation of order. 1 month has passed after providing proof of banking and still no refund. Mercedes South Africa customer support also not helpful. Dont respond to calls and offered little to no support.