Vox Telecom Useless

I recently cancelled my contract with Vox Telecom. I did the cancellation as stated by Vox, a month ahead of last month of service. I then sold my iBurst modem. I asked them to do a change of ownership on the modem as the person I sold it to cant use the modem if it is still listed on my name. They then advised me that I had to wait till January 2015 for the contract to expire. They also sent me another statement for R198 even though all my payments were made as I did the cancellation. They then advised me that they will do a refund. Luckily I did a change of Credit Card to avoid payment going through. The person I sold the modem to stated that he failed to put the modem on his name as it is still active on my name, this happened after my contract was cancelled. Spoke to them this morning, they told me my contract was renewed, without any communication from my side. It is now 3 days after contract termination and still no one can assist me regarding my modem transfer, I have never dealt with any other company as *********** as Vox. I recommend that anyone considering Vox will stay away as far as possible, they are useless!!