Terrible after sale serivce

I bought a Bosch dishwasher from Game around March 2019. Worked excellently. However by June 2019 it started giving troubles. So we contacted Bosch call center in July 2019 and since then after probably more than 20 phone calls, 3 reference numbers and 2 visits from the technicians nothing has happened. After the technician visited us the first time and we logged the second call out we had someone phone us from bosch telling us to check something about the float because if they come out and the fault was on our side they would charge us- We refused to check it on our own because if something would get damaged while we fiddled with it then all the blame would fall on us. Then, since our third reference number was given to us and the call out was logged about 2 weeks ago we haven't received any feedback from the call center or the technician. My mum phoned in again at the call center today and asked to speak to a supervisor because this is going on too long and she had the phone dropped in her ear. Its frustrating and disappointing that after purchasing such an expensive item it begins to trouble only after a few months and even more frustrating is the service we are getting.