Cancellation gone wrong

Good day<br> <br> I requested an upgrade on 12/03/2015 but immediately cancelled it on 13/03/2015.<br> <br> The courier came to deliver the upgrade on 09/04/2015 whereby i sent the package back as i cancelled the upgrade. I phoned the cancellations department on the same day and told them that i sent the upgrade back as i cancelled it on 13/03/2015. The guy advised me that he will request the upgrade to be cancelled imediately and assured me that i will not be billed for the account as i cancelled it in March already.<br> <br> I received my latest statement and found that i am still being billed for the account. I phoned the call centre on 20/04/2015 to dispute it and was told that someone would get back to me. Today i phoned the call centre again and Bianca at the cancellations department informed me that the upgrade was not cancelled due to the device not being received back.I am highly upset as i sent the device back 2 weeks ago already and now i am being billed for it. Also, i get billed for the phone calls where by i get placed on hold for 20 minutes for Autopages mistake.<br> I need this to be sorted out as soon as possible becuase i am sure you wont reimburse me for the money i use to phone you