Hifi Corp Polokwane Hisense U962

We bought a Hisense U962 phone from Hifi Corp in Polokwane. I updated the android OS and switched off all unnecessary applications (GPS, ect.) The battery life of the phone after a week went down to 6 hours after full charge. No phone calls, no web browsing during that time, which is unacceptable. We took the phone back after 9 days and I factory reset the phone to wipe our data off. The staff told us they couldn't replace it because it was past 7 days but none of the staff told us we only had 7 days when we bought the phone. On the slip it indicated 14 days. They said they could only send it for "repairs". So we gave them the phone so they could check it, they said they can't check it because it needs wi-fi and they don't have wi-fi. Terrible service, terrible product. We took the phone back from them, now they have lost a customer permanently, I will never buy anything there again.