3 Cancellation requests and still no response.

I tried to cancel my tacker account on the 31st July 2015 and I was told that someone from Tracker's retention department would contact me in 48 hours which did not happen. I phoned Tracker to cancel on the 6th August 2015 and was told that they would cancel my account within 48 hours and that I would get a phone from the retention department to confirm. I phoned tracker again this morning (12th August 2015) only to find that my account had still not been cancelled. I have been a loyal customer for over 6 years and this is how I am treated. I am going to tell my bank to block the debit order because this is just unacceptable. Tracker Connect is absolutely appalling.