Shocking service

Can someone urgently assist me I took my car 3 months to GM Zambezi for my 45000km service, they never reset after the service I took it back and reported this fault , this was advised that it was fixed, last week my car showed the same error that the car needs to be serviced soon and its only 3000km after my service?

I refuse to take my car back to Zambezi as their service is completely unprofessional, I had to phone constantly for updates on my car and the lady that dealt with my service the last time was rude and very unhelpful, Im sure if my history is pulled the consultants name will be there.

I tried to phone the Menlyn branch the phone just goes unanswered.I then resorted to the customer care contact centre and spoke to a lady by the name of Nomsa, I think she was chewing on something while speaking to me and was also very unhelpful she firstly said that "oh call the dealership"I then rep**** the phone goes unanswered how can you help me?She then said let me take your number!

The service I have received to date is shocking and no one seems to want to assist me, so can someone please get back to me in order to get this matter resolved!!