Cahneg of debit order

I have been trying to change a debit order from my late husband's name to mine. What a nightmare! I have spoken to 9 agents now. I can name most of them. My tracker which have been paid 3 years in advance have been cancelled. Then it was activated again and now cancelled again without my permission. I have also asked someone from tracker guard to contact me and after more than a month no one has contacted me yet. The other thing they do is they would call you, the phone would ring twice and then they would put the phone down. You then receive a sms saying that they are trying to contact you. When I return the call, basically immediately no one would answer the phone. I was on the phone with one agent for 56minutes 24 seconds thinking I have managed to change all my details as requested just to hear the next time that things have not been changed. I am confused because I have received a note to say that my tracker has been activated again but how do I know for sure. I am still waiting for tracker guard to contact me. I would NOT recommend these people's services at all. I have asked if I could have the CEO's telephone number because that might be the only solution.