Contract to never have an annual increase, yet I am billed with an increase? Complaining just gets me credit, but no lower in increase

I signed up for a 2 year contract in 2016. The sales person sold me on there will not be any annual increase. He modified the contract and signed on it. I agreed.

3 months after my first year, I notice the monthly amount had gone up and specifically remember the contract. I emailed PF the following, ticket number PF ********** : "When I signed up last year June/July, the salesman explained everything to me and even sold me on there will be no annual increase in the membership fees. This was assured in writing in the contract. However, since August, the monthly fee has risen from R269.00 to R295.90. This is not what I have signed and I'd like credit of R80.70 (the 3 months of this increase) as well as the original amount of R269 per month in place again. I look forward to hearing from you. Thank you."

To which I received the following reply: "Dear Member Kindly note that the R80.70 was credited against the membership meaning that member will only be debited 188.30 for the month of December and for future debit orders it will be 269.00 Yours in Fitness Planet Fitness"

The following month, I did receive the credit as promised and was charged exactly as the representative described. I was happy.

This morning, the amount of R295.90 was debited against my account. Now I'm really not happy and quite frustrated at having to deal with this again.

It seems to me, either you are deliberately trying to sneak it past me in hopes that I don't notice, your people don't know what they're doing, or your accounting team forgot about this adjustment and went back to the new annual amount (which I hope is the case).

I want this money credited (AGAIN!) and the debit order adjusted to the original amount of 269 as per your contract, AND for a supervisor to confirm this has been done and will not happen again. Thank you.