Incorrect debit order billing and impossible to reach accounts department

I have phoned Fidelity/ADT numerous times the past week about unauthorized debit amounts on my account. I was double billed in July, and have been charged radio fees in contravention to my contract. The call centre cannot help, and the person dealing with accounts (Guerra Ferreira) phone number doesn't work and his emails do not go through. I managed to reach him once and he promised to respond by email - I am still waiting.

This is unacceptable. Please contact me to arrange a refund on the excess amounts charged, or I will be forced to use another security company.