Horrible customer service

My husband and I as first time buyers bought house in 2016 with Valuemax at Clayville and was financed by FNB. In 2017 we started to experience pops and cracks in and outside the house. And valuemax would come and ''fix'' it. Then early this year the cracks got worse which we made another appointment for them to send an engineer which was requested that the plastering to be removed, which we had to move out (almost 2months now)and a temporary place to stay.The ''engineer on his report stated that half of the house has to be rebuild. We refused and requested the developer to rebuild the whole house as it might cause issues in future. We took this matter to FNB as they have appointed the engineer to check before we both signed the happy letter ( we signed the happy letter based on the outward of the house, but without knowing that the bricks of the house were laid out properly). We send the complaint to FNB 3 weeks back and we haven't received any feed back or call to state their side of the story. Or got any assistance. We don't know when this be resolved and we need to back to us. Everyday when I go to the office people are complaining about the horrible service and not being competent. People have families and would to be in the houses in peace and safe.and put yourselves in our shoes.