Poor Service from Mix Telematics Accounts Department

I've canceled my Beame tracking device 2 months in a row now, but yet the money still gets deducted from my account!! Ive spoken to 2 people in their accounts department with no success.

The first time I phoned (2 months ago) the guy I spoke to told me he will phone me back, and to this day nobody has come back to me! Earlier in April, I phoned again to try and cancel this account with still no success. On the 1st of May another deduction was made on my account.

Ive sold my car early April and I am still paying a Beame device?? And to top this off, I still need to pay a cancellation fee on top of this? This is really pathetic service!! I will never use any of Mix Telematics services again.

Can someone please tell me what I need to do to cancel this tracking device??