Unsatisfied with Bosch appliance abs their service

I bought a set of built in Bosch stove @ makro in June 2018 and after 3 months of working it stopped working and I reported because it's has a 5 year warranty. The electrician came and a new part was ordered and it worked again. After another 2 months it gave me problems again. I called in again the electrician came and he claim that it was fixed but when I got home it was still giving me the same error message, and I told him and he promised to come and never did. I had to log another call and they came it but only 3 plates worked and he promised to order a new plate and it was never delivered and fixed until it stopped working again. In August I had to report again for the third time now because it was not working again it was just giving me an error message. I had to make numerous calls but eventually they came and fixed it and but still the 1 plate was not working only 3 worked. In November again 2 plates stopped and only one was working. I called in again and the technician came for the fourth time but this time they didn't fixed it up until today. I'm sick and tired of their service because really it's not satisfactory. I paid almost R10 000. 00 for the stove that only worked for 2 months and it's not fair