Worst Bank in the Planet

I have been banking with sbsa for 13 years and am utterly embarrassed by they lack of compassion and professionalism, I owed my chequered account which I had with Standard Bank an amount of R5600,i couldn't pay it due to the fact that I was not working for a year I only got a job this year July. When I initially received my first salary in July I had notice that an amount of R3610 was taken off my account without my permission only to find out it was standard bank. When I called Standard Bank they advised me that I was still owing my chequered account so I went to the branch to try and reverse the amount but no luck so I left it. In August I called Standard Bank to make an arrangement regarding my chequered account I was at the Randburg branch so I used their telephone to contact the specialized collection department and I spoke to a lady by the name of Puseletso and made an arrangement with her regarding my chequered account that I will pay an amount of R300 a month for 9 months till the chequered account is paid in full and they agreed that they will not take more than R300 a month, the arrangement was agreed on finalized. On the 27th of this month of September I noticed that Standard Bank had debited my account once again for an amount of R2610. 55 which was not the amount we had agreed on,the amount that was suppose to be taken was R300. I'm currently stuck with no rent money because that amount I was suppose to give my husband to pay rent, I went to a standard bike branch today 30 September at the Glen mall to query what has happened, the lady who assisted also agreed with me that there was a note on the system stating that the arrangement of R300 was agreed upon, so I really don't know why they didn't stick to the arrangement we had initially made, can you please help me I'm really struggling and really need my money back so I can be able to pay rent otherwise we will be locked out, but hey sbsa is a bank that shows no empathy to its customers and no loyalty what so ever