Terrible customer service

I have cancelled my cover as I'm immigrating effective as of 12 February 2018. I paid my January premium at the end of December 2017. Today I get an SMS from Tracker that they going to debit my account as my insurer did not pay them for January 2018 premium. First I called Dial-Direct and the lady who answered assured me they paid. Then I phoned Tracker and they said they did not receive a payment. I then recalled Dial-Direct and then they came with all stories about my contract with Tracker expired and they don't work with tracker anymore. I told them they have two options. Either they pay tracker from the premium that I already paid at the end of December 2017 for January 2018 or they reimburse me for the amount that will be debited from my account. The consultant kept speaking with his supervisor and promised to get back to me. Still not a word from Dial-Direct. Please do not support this absolute useless service of a company.