Cancellation of month-to-month agreement

I have been trying to cancel my month-to-month agreement with Tracker since April, 28, 2015. Numerous mails have been sent to [Email Removed] I called your call center on April, 30. Spoke to Lizzy. The call got cut off. I struggled to get available agent. Nobody called back. I called again on May, 2. The consultant advised there is another mail address for cancellations. Nothing mentioned on Tracker T's and C's or website. She logged information with department and gave me mail address for cancellations [Email Removed] Who knew??? I forward all my mails to this address. I followed up few times. No response. I called again on May, 8. The agent advised that the agreement was cancelled and there will be no more deductions from my bank account. I requested the cancellation letter as a proof. It is May, 12. I didn't receive any letter yet. Why is it so difficult to deal with Tracker? I have been with Tracker since February 2015. It's been the nightmare from the first month. Wrong billings. Now problems with cancellation. I regret I joined your company. Provide me with the cancellation letter effective 28/04 when I sent my 1st mail.I also recorded all conversations with Tracker.