Fidelity not Tracking their Services and Customer services

My wife had a new tracking unit installed on her vehicle last August by Fidelity.

It was a special that includes the wireless tracking unit for R99 a month.

Since September installments of R199 a month has been deducted.

She has contacted Fidelity on numerous occasions requesting that the amount be rectified however she is always transferred from one department to another and back and forth and eventually told that a supervisor or manager will get back to her but to date nothing.

She has contacted the accounts department that informed her that they will look into it and get back to her but again nothing.

Most recently was this week when we contacted Fidelity regarding installing a unit in my mum's vehicle and again queried the incorrect amount of the debit order but again they said they will get back to her and nothing.

The technician that installed her unit came to install my mum's unit and also called their offices to enquire about the incorrect amount and was told to give us a customer services email to forward her complaint.

I don't understand why this is happening and why Fidelity is only too happy to install another unit in another one of our vehicles and receive payment for this but not solve the issue my wife has been having being charged more than double the installments for her unit for 7 months now.

Please can you explain and possibly assist.

Please please please.