ADT charging Clients for services without approval or communication

I received my monthly invoice and found that my monthly fee was increased without any approved and/or communication. ADT/Fidelity installed cameras and then passed this cost onto customers as part of their recovery. I was then sent an increase letter based on this new amount. I have contacted the accounts department via mail and telephone no less than 5 times without any resolve. The only communication I received was a forwarded email that it has been escalated. It has now been 3 days since my last follow up. *** and hpcamanager.jhb.za&fidelity-services.com - need to work on your customer service. Really appalling.