Hisense T5 Plus NO SIGNAL

I purchased the T5 Plus in April this year. The signal drops so badly that i have NO coverage whatsoever (Its not my service provider as my whole family are on same network and its only MY phone) and when on charge it either doesn't charge or when i unplug it the battery icon on screen shows its charging!!!! i hadn't had the phone for two months. I've taken it back to Ackermans and have requested a refund! This is ridiculous Hisense! Something needs to be done about this please. I cant work if I don't have a phone as I run my own business.