Bad service from Cell C

Cell C contacted me on the 28th April regarding an upgrade <br> Offering me a 7 inch Samsung Tablet<br> Delivery was promised for Friday the 30th April. <br> I only received the tablet on the 4th of May, after phoning them again.<br> R1069.00 was deducted from my account on the 30th of April. (for March account)<br> The tablet was only reconnected on the 5th of May.<br> This was an upgrade of my laptop that was ****** in 2013. I requested a new number cell number, after phoning the number and discovering that someone else is using the same number.<br> When I checked my data balance, I discovered that there was already an additional account for April for the amount of R 1799.00.<br> After numerous calls and two reference numbers<br> *** on the 12th May:<br> and 15th May, ref no ***.<br> I was promised that they will call back within 48 Hours, <br> I phoned again on the 18th May to query regarding the reference numbers and their lack of response to my calls.<br> Today on the 20th May after being promised that my query will be \urged"still no response. How can I be billed for March and April"