Mix Telematics vehicle tracker

The worst tracking company I have ever seen. They **** people as well. I had a tracker and had signed a contract for only a tracker. After a few months they start taking double the amount of the tracker when I called they said it was value added service to y surprise which I had not signed for so they told me they will check the recordings and let me know. I had to call to follow up for 3 good weeks with no tangible response. I cancelled the tracker and even after so they still send me invoices with the amount increasing every month. I would like to advise anyone thinking of doing business with this company to think twice before engaging and regret.