ABSA PAY ME BACK MY MONEY!!!!

I ordered on Shein, my items calculated to R2 398.00 and Shein took double the amount. I then cancelled my order on spot, and I asked for a refund, the refund was obviously going to take time, with that being said I then went to the bank and asked for a reversal amount with is R4 786.00. The reason why I asked for the reversal from the bank it is because I am a student and I need to buy grocery and other essentials I need as a student. The reversal was granted to me by the bank, but another problem here is that when the Shein amount got uncleared after 10 days, it took the remaining balance I had in my account which was R2 990. Reason being it is because the Shein got cleared and took my money because remember I had reversed the amount, and they debited me the R4 789.00, so when they had to debit me R4 789.00 they found R2 990 in my account and left me on a minus -R1900. I was told that by one of the consultants at Absa (I know their name) that I won't be charged for an overdrawn amount, but when my refund from Shein entered my account. The bank took my money R1900 for an overdrawn amount that they claimed it won't affect me. They are now coming with stories and telling me about authorization. I have supporting documents to support what I am saying, and my evidence supports that I am entitled to that R1900 that the bank took from me. I am a student, and I am suffering. I cannot even buy simple bread because Absa took R1900 that doesn't even belong to them. Please help me with this matter, I have been at it for 2 full weeks, and they just throw in "I am sorry for the inconvenience" without even giving me my money back. HelloPeter please help me escalate this matter, and I trust that you will get to the bottom of this on my behalf. Please attend to this matter, and help me get my money back from Absa as a struggling student. These people take advantage of me because they can see that I am vulnerable, but how can a dispute at Absa take more than 2 weeks to be sorted? I mean it is straight forward and there is evidence. I want to send evidence now to you so that you can see what I am dealing with.