Unhappy customer servixe

I had a error code on my car which I went to car service city Montague gardens which is on motorvaps group. This is the first time using the service. After my gear box was replaced I still had the error coming up more now and motorvaps did not what to assist with anything after that or help me. I had just lost my husband and was very unhappy. I even went to ombudsman and still no help. I feel very upset that my gearbox was replaced R40 000 later and the error was not fixed which I initially wanted fixed. After reading up I found out that it's the gear selector that's faulty and now that my insurance is lapsed I have to fork out money