Hob and Oven still faulty after 10 complaints????

SInce 2013 the hob and oven I purchased have been faulty and numerous calls lodged and this is now the 10th time Ive made contact with Samsung and fault not resolved. The most pathetic client service in SA. Yesterday the technician admits the model is faulty and should be replace yet we must be refunded and DEPRECIATION taken into account with the difference paid to me - ***? Then Samsung will try help with a new discounted price should we buy another hob and oven. Karabo from the call centre and now the staff at Samsung head office who are aware of this have not even bothered to contact us today. I have sent in a detailed list of the 10 times Samsung has been contacted and issues raised yet 2 and a half years later after 3 replacements and now a potential 4th the issue is not resolved. Which bright spark thought replacing the same faulty model now potentially a 4th time would improve the issues? Clearly Samsung do not value clients and CLIENT SHOULD AVOID BUYING ANY SAMSUNG PRODUCT. YOU ARE A DISGRACE TO CLIENT SERVICES AND SHOULD NOT PRETEND TO HAVE A CLIENT SERVICES DEPARTMENT