FNB System glitch affects customer

We opened a flexi account and app**** for a future use amount on our Home loan. I was assured that I would have immediate access to any money transferred. Received notification flexi acc was ready to be used and after transferring my savings the available amount to transfer out again was ZERO. I contacted the consultant and was told that my money was absorbed into the account and I would need to apply for a readvance to get it out again. This happened because the future use was in the process of being paid out. Had I transferred my saving after the future use was paid out then I would have access to my money. So this was a systems timing issue and I now no longer have any access to my savings unless I go through additional paper work. There has been no apology for the system mistake, No manager has called us as promised from the consultant. Why do I need to go through the hassle of applying for my money when it was a system error? This is not fair. I was told that I would have immediate access to any money I transfer. Disgusting service. Please can someone contact me to get this sorted, it's been going on for 2 weeks with no resolution. FNB take responsibility of your mistakes.