Liberty - Own your life rewards - Poor Service

I have been trying to cancel my subscription for over a year and a half. An amount of Approx. R 610 gets debited of my account. I have called numerous times but no got back to me previously, I wait and a another debit order goes off. Bear in mind over the last few weeks another debit order went off while i was waiting for them to get back to me.So subs amounting to approx. R 10800... I get offered 15%. I did not use the service during the time I was trying to cancel the subs. I have not gained any benefit from them. I am now told that I must remember over the last 18 months which telephone number I used to called them. I explained that due to my work I use different office numbers and even different mobile numbers. We are not told that we should keep these numbers for future queries! There is proof of some my calls and not others. The poor service is clearly shown when I called last month and no contacted back, only to have another debit order come off. Very Frustrating and and now out of pocket for more than R 10 000! This seems to be the norm with the larger companies. Extremely Disappointing!!! Future investments, policies etc......never go to Liberty!