disappointed with Telkom services at Canal walk

I bought 2 phones Huawei P8lite on contract,the other phone has a problem of battery which drains so fast,l took the phone back within 7 days for exchange,but they refused to give me a new phone,they said they will send the phone to the technicians for repairs,l did booked the phone in but its almost 3 weeks no one phoned me to update me of any developments,up until now am stuck without a phone,and am suppose to pay them full subscription...Ref number TOC001315