Change of Payment Terms

Good day. I took a Capitec credit card which the agreement I signed was that I will pay R1300 monthly if I fully use the credit amount. To my surprise 15 October they deducted R2300 and October R2500 and for December they say they are going to Deduct R2500 again. I called the call center on 7 October 2019 after receiving the sms that I will pay so much in October and a consultant promised me that they will only deduct R1300 and not what is in the sms. Today I phoned again and I am being told a different story.