Wrong contract opened and never closed it

I opened an account with the store on the 22nd of February under the impression that it was uncapped. on the 28the of February I received a message stating that my data has been depleted which is unlikely as it is supposed to be uncapped. I then cancelled the line on the 29th where Katleho phoned to confirm it has been done. today on the 15th of March I receive an invoice for the line that was never cancelled!!!! <br> <br> I will not pay a cent and you can get the money from Telkom Irene as they keep on messing up on their side.