Unable to cancel contract.

<p>So back in Aug 2016, I phoned the call center to cancel my contract. I was transferred to cancellations department where a lady assisted me with the cancellation process. On the 24th of December 2016, I noticed I am still being invoiced even though I canceled and that the contract ended Sept 2016. I phoned the call center on the 24th of December 2016 whereby I was told I cannot be transferred cause the phone system is broken and I can to email ********** to get the issue resolved. I emailed the mentioned address on the same day and even received a confirmation. Until today(5 Jan 2017) I have not received a single response. Phoned the call center yesterday(4 Jan 2016) and was transferred to the retention department where I was on hold for more than 10 mins, eventually dropped the call as it seems no one was there and I am wasting my money. </p>