SIMcard ****** during repairs

1. I handed an iPad (on contract with CellC) in for repairs last October as connectivity was intermittent (2017) 2. After a few weeks, I was told that the device was blacklisted due to my not informing the police that the lost iPad was retrieved. I submitted all the affidavits and required documents and the blacklisting was lifted. 3. Subsequently the device was sent for repairs. While it was at repairs they asked me to switch off the location tracking. Which I wasn't able to do, so I asked them to return the device to me. This took them very long, and they only returned it yesterday (8th) to a CellC outlet. 4. On my arrival there I was asked for the simcard and I insisted that the simcard was not given to me when had I handed it in. They did not issue me with a new simcard and found that the simcard was missing. 5. When they checked the system, they informed me that the simcard has been active since 9 January by someone else. I asked for a screenshot and it shows calls to persons unknown to me. One of the numbers was called by your shop staff and a person called Thabo answered. This person was not known to me and hung up when he realised it was an investigation. 4. I therefore conclude that someone within CellC gave the simcard away or lost it, thereby enabling some third party to make calls at my cost. 5. We used online identification tools and have identified some of the call recipients and they are definitely not persons known to me. 6. I want the charges reversed and refunded, the simcard deactivated, and a new one supp****. I would also like CellC to investigate further and identify the culprit.