Big balance on my account, it never goes down.

I am so dissapointed by Edgars Store.I got a phone call from thier call center agent around Feb/Mar this year. this person was selling me insurances, Jet club something and other few things that i dont even remember.We ended the conversation with the agent on the note that she isnt gona add those things as my accounts was on arears. i got a shock when i went to the store because i colud not understand the big balance on my account. i asked for an interim statement of my account and i realised that they have been charging me for these things without my approval they cahrged me from Nov 2014 even though they phoned me in Feb. i phoned them and spoke to different people to get them to remove these charges in my account and to cancel these things, they cancelled them but never minus the charges, each time when i phone they always tell me they have taken my query to the manager and they will get back to me, always! & they never come back to me! its been 7 weeks now im still waiting for them to come back. after i asked them to get me the record of the phone call with the agent to here what we agreed on, they stoped phoning me and even to collect since they say phone calls are recorded.