Matrix do not communicate at all

My mother is 89 years old. About a year ago somebody phoned her and tell her that they are in the place of tracker by whom she had a tracking device at that point. They came and install the device. at the end of that month both of them withdraw money from her account. She went to trackers office and they told her to stop the debit order from matrix because they are still in business. I wrote a email and asked them to cancel the contract but no response. I phoned several times but they just put me on hold and nobody ever answered. I also logged a complain on their web page. no answer. No communication skills at all