Systems Errors

Last night more than R2000 went off my account from purchases that was named exactly the same as ones from almost 6 months back. This automotically placed me in the negative and with no funds till the next pay day. I phoned the ***** line and they said I must just go to a branch to ensure that everything is okay. I went to the branch and after investigation it has been POS sales that was made months back but that was only deducted now. There was no indication that there was any funds that was kept for any purchases and for months there was nothing on my statements that some vendors still had to deduct there money. On the ABSA system it shows that the vendors have been paid on the day of transaction. This seems to be an ABSA mistake and now I am left with no money due to their mistake. I really do not see why I should be affected for ABSA's mistake and issues with their system. I am now left with 2 weeks of having no money. This is really pathetic and I am thinking of changing banks if this issue is poorly dealt with. I have been a loyal customer for years, but this incident is beyond just disappointing. This should not even of happened in the first place.