Computech financial service are ****** and ***** money from your account

I registered and when I got an email that said this must be paid monthly for no service I cancelled straight away, for more that 2 years they still deduct from my account and they do not respond to any emails. when you phone them they leave you on hold until business close then phone drops automatically. They ask for bank statements and letters to do refund then after you pay a lot to pull statements they just ignore you again