telkom is *****ing my money

I took out a Huawei B593 LTE contract on the 17th of February on which the sales person advised if I am not satisfied I can bring it back within 7 days. I took it back on the 23rd of February cause I had poor coverage in my area. But this contract has not been cancelled. I have been paying for this since February. <br> <br> I have been to the Canal Walk store numerous times which is not close to where I live and i have phoned numerous times the customer care. I am paying month after month for something I dont have!!!!!!<br> <br> Please can someone assist me!!!