Struggling to cancel numbers I do not want!

I called in 2 months ago to cancel contracts that I did not want any longer only to find out that it was never cancelled and they are still billing me. I called in again and they dropped the call twice!!, I had to call in a third time and was told I will get an email as soon as at the process was done that was 2 days ago still nothing. Vodcam are quick to open a contract but you can never seem to get thr right person to cancel why is that???