Contract Cancellations

I have two Telkom Tablet contracts @ R99 per month each. The expiry dates are 03.02.2016 for the one and 11.02.2016 for the other. In October 2015 I asked for these contracts to cancel upon these dates, as I no longer need the service. They asked me to send the request again after 3 January 2016, as it must only be 30 days before cancellation date. I then sent the requests again on this date. I kept sending it at regular intervals, I spoke to the call centre, I even asked for assistance on Facebook. The contracts were then charged month to month at R49.00 per month each, which I paid while waiting for them to cancel these contracts. On Friday, 4 March 2016 I received confirmation that the contracts were cancelled. On 5 March 2016 I received invoices for R193.14 and R172.17 respectively, as I now pay \full price\" for the contracts. I want these bills cleared, as I stated numerous time that these contracts should expire, AND they cannot charge me now again for the tablets, as they have been paid in full already!"