Not a happy camper

I am usually very happy and satisfied with this amazing company and what they have to offer, but I was so disappointed when they were not able to answer a simple inquiry about my credit card... I went to one of their branches to get one of their services where I was told that my credit card installment would be combined with this service installment each month making it one payment instead of Two each month. Well my credit card debit did no go in July and in August then next thing I know and unexpectedly in September they make a debit, I go into one of their branches and no one was able to state the reason of what has happened all I was told is that it's not showing on their system why I was not charged for 2 months and then charged again in September. Mind you in my mind I only have one payment per month