Vodacom has suspended my line

On the 16 February I made an error on sending myself data on a month to month bases, I realised my mistake and I phoned Vodacom directly after I had done it to cancel the service they then told me I must pay the full amount and they will see if they can credit it at a later date. I said this will not happen as it was not my error the call centre advised me this service was cancelled and I had nothing to worry about. Vodacom has now suspended my account and told me that I had not paid in January this is not true. I will hold all payments back from now on until this is resolved by Vodacom. Vodacom think they can hold their clients at randsome and do as they like and charge what they want. and if you don't pay them for their errors they will cut you off