Waiting on feedback

Signed up with Moimooi end of Nov and started my treatments Dec. Overall experience has been good except now March where my debit order was increased. When signing up Nov with the corporate dept who was at our Pinelands business park we were advised that we will pay R399 for any 5 treatments per month and will not be increased in Mar as we only just signed up. This did not happen as my amount was increased from R 399 to R499 a full R100 even though in the contract I signed said 12 % increase which equates to R47.88 I phoned Moimooi and was told that Diane will phone me back, after no call I phoned again and spoke to Adinaan who said he will speak to corporate and phone me back. One week later no response. If someone at Moimooi can please sort out my query asap.