Bad services, No sense of customer service

On the 31.07.15 2015 received a call from Cell C for an upgrade on my Data contract as it was expiring in September. On the 01.09.15 an AG Tablet was delivered to my work place, Since it was a brand i was not fami**** with i went to Cell C store to see the product and it was of poor quality so i decided to return it. They then sent for collection on 07.09.15 and i was told it will take 7 days to be cancelled. I have been calling Cell C since then for the upgrade reversal. Multiple cases were lodged, Customer care agent have been promising me someone will contact me regarding this.I have sent multiple emails to them with no response.On the 23.12.15 was still trying to get this resolved, an agent lodged another case again and said it will be done in 72 hours. 30.12.15 was still on the same compliant and it was not resolved. 02.01.16 still on the same case and i had to request to be cc on the email he was sending to the department manager since their word is empty promises . Which was done .I have been billed since 15.10.15 for an upgrade i already <br> returned.To date my case is still not resolved. This is the experience i have had with Cell C.I will not take up a contract Cell C again