Unhappy Client

On the 5th of October I did an upgrade and the sales consultant sold me dreams regarding the phone. Went back to the store the next day to return the device sincewll I wasn't satisfied. The consultant then told us to lay a complaint to the customer service of which I did by sending an email to them. With no reply I called the customer care line and was being told different stories all the time I call.

How does one go on about this since we'll I won't be paying for somthing that I'm not happy with? And it's been going on for a month and a few days now. CAN THIS MATTER BE RESOLVED URGENTLY.