Poor service received from Vodacom Eastgate

Horrible experience at Vodacom Eastgate. Took a contract on the 19th, was given Honor CX6 phone. There is a tiny issue with the speaker, not clear. So I went there on Saturday afternoon explained situation to them. Long story short-I was asked to join the line to the Team that tests the speakers. The gentleman who assisted was wonderful, did a couple of tests realized the problem. When I asked for the phone to be changed , was then told they have to book it in for 7 days and I then asked what I will use for next 7 days as I needed the phone for work. A supervisor was called, lets just say ***********. She did not know what to do. The gentleman who had assisted testing had more knowledge than her interms of the solution and what he could offer. When I said let me rather cancel my contract, she quickly rushed made phone calls to help cancel contract. A true Ambassador of vodacom wouldn't you say? No solution just an order taker. She then asked that I come on Monday, I dont see how we can work it out as she has nothing to offer. This is Vodacom shop by Checkers in Eastgate. I'm on a 36 month contract with a phone I cant trust to stay for that long