Appalling service affecting my credit profile

I have received appalling service from standard bank as a matter of fact their unprofessionalism has even affected my credit profile i was provisionally approved for loan of R50k subject to approval of submission of docs with another company but they ****ed up my credit score.I spoke to a consultant by the name of Sipho Motha over the phone at their branch in randburg assisting me with changing my payment day for my vehicle account i have with them and all was fine he even sent me a reference number of my logged query via email a day later as proof that the date was amended however few days later say after a week or two to be precise on the 6th of September R5000 was deposited in my account next thing the deibted R4800 and my debit date is on the 25th of each month now i called in the same day spoke to Sharon Nong and she promised to send Sipho a email to call me.Later that day i called again still nothing from Sipho now i speak to Arantxa Moodley that assisted me but insisted i provide her with the reference number i received from from Sipho now i work for a bank as well i never wanted to waste my airtime told her thank you but i do not want to provide it because i know for a fact you wont assist me with a special reversal since Standard bank debit me on a wrong date, she still insisted i may help she called me back i explained the story we spoke for like 20mins until i asked her so can you help me and she said no that on its own is disturbing it questions TCF ( Treating customers fairly).I went to my bank to have that debit order reversed because i needed to use the money and i got home faxed my docs to the other company for my loan application few days later i am called they telling me the might be a little problem with my score all of a sudden so when we were talking i told the consultant i did reverse a debit order a few days so he checked for me and it turns out yes it is that because i even went an extend of calling trans union.I work for their competitor my partner works for Standard bank and i liked it myself hence i even took a vehicle account with them i was even considering applying for a job with them but at this point i even want to cancel everything i have with them i am so perturbed cannot even explain but now that i am adamant they costed me i am so coming for them with everything i have