Upgrade but still waiting

<p>We upgraded in the beginning of December. We used the phone for 6 days and took it back. Because it is still under the 7 day period warrenty. They said if we take it back within 7 days they will book it in as a OBF. We received the phone back on the 24 of December and they said to use the phone because they can't see anything wrong with it. on that same day we went home and used the phone and it happend again, so we made a video and we took the phone back to CellC in Witbank Mall and we showed the Maneger Sibu there what the phone does. so they booked the phone back but this time it was no longer a OBF since it was past 7 days. the phone us on Friday the 13, 2017, telling us we can collet but nothing was done to it. we resend the vedeo's to the branch manager and booked the phone in again. But the phone was only send in on the 17 of January 2017. when we phoned they rep**** and said they can only provide us with feedback next week of first week of February. PLease advise on what to do next as this is getting out of hand and we don't get feedback or response. Thank you </p>