Bad service

I gave my security company (Bestsecure) notice of cancellation on the 15 of Feb 2019 after they failed to respond to a panic button. Subsequently they were bought over by National security and to my surprise I was billed from Feb up until now. When I queried the bill , they requested any form of prove that I requested the contract to be cancelled, never mind that their unit was de-installed and they never picked it up. I provided proof to Peter from National, who promised the issue would be resolved and that he would take care of it personally . well it is now a month later, 6 mails, couple of calls , lots of empty promises and still nothing . The last communication I got was on the 18th of December stating that they have made credit notes, but when I requested an amount and date of credit they went all silent again. National I would recommend you re-look at your code of ethics you have on your website