Huge delays sourcing parts, no customer service, networks downs, cant help

Car went in on 19 Jan to get a new pre-fuse box. Mercedes do not stock the part, was informed it would take 3 weeks to get (they said they would try get it earlier) - No communication from them since, We are heading into week 4 now and after calling to check whats going on, their systems are apparently down for 2 days and they have NO idea whats going on with the cars as they say "they cannot check the system" - Honestly, do yourself a favour and DO NOT buy a Mercedes in South Africa. Furthermore, one technician has told me they are all leaving and service delivery is becoming absolutely useless. I advise to avoid this company. Sell your Merc and get a VW instead. Never had a days issue with them in 10 years.