Consultant lies in order to get double payment

During February i was called by one of Standard Banks consultants who advised me to make a double payment on my credit card so that i do not have to make payment at the end of March 2020. I agreed to the debit order of double the fixed amount i normally pay. Now Standard Bank keeps calling me demanding that i make another payment as the double payment is not considered for this months due payment. If i had know this last month i would not have made the double payment and would have kept the money aside to pay this now. Standard bank is providing false information and their consultants are misleading their clients. I have been with Standard bank for almost 20 years and i am really dissapointed and disgusted intheir service regarding this matter. How can i trust the bank with my money if they are not trustworthy and transparent?