Cancelled membership

Membership with Flexiclub was cancelled a year ago, there were stacks of points available and R35 000,00 in the money bank. We were advised that the points and money had to be used up with booking by the end of December 2014. Points were allocated in order to utilise the left over money in the money bank. Flexiclub have now come back and said there is R3500 owing on the account and it will not be closed because they found a double credit that was one in August 2014. I cannot believe that Flexiclub can come back at this stage advising this when booking were been made in order to use up the money in the money bank. I have queried this with flexiclub, I waited four days to get a response to my query and that was after phoning and emailing continuously and now when I ask to speak to a manager Margaret Francis she is in a meeting and I must just email client care, not I want to discuss this appalling service with Margaret Francis or someone who is on management level