Wrong billing

I was billed a R380 per month for 12 months vs R90, that I was supposed to pay through my Discovery Vitality. That is R4560 for the year vs R1080 what is was supposed to be. That is R3480 too much. Just because the person that did my contract, ignored the fact that I have. Vitality. Virgin Active paid me R110 as a refund - SERIOUSLY??!! This is Virgin Active Red in Boksburg. The they still have the audacity to call me with a new offer, for a R150 per month. Something they do for all the members that cancelled. Ridiculous. All they do is shrug their shoulders, and say they are sorry that it happened. This is unacceptable.