DooGee Mobile & Cash Crusaders poor customer service

This is my third DooGee phone in four months. Always the same problem. System UI not responding, Processor not responding, True Caller, Whatsapp, Instagram, Accuweather and all other apps also gives the same error - Not Responding. DooGee mobile only refers me back to the Cash Crusaders store from which i bought them. They only tell you that they are prepared to give you a buy-back option. So each time I loose about R500 on the purchase price and then have to pay in an additional minimum amount of R500 to buy another phone from them. I've contacted the store from where i bought the via email on 23 October 2018 and got no reply up till now.