Pathetic service from ABSA bank.

I am currently banking with Absa for many years,I had app**** for an increase in my overdraft on my cheque account which was approved,I was then unable to accept the quote on my internet banking due to an absa technical error,I then called into the call centre,spoken to a consultant and they assured me my overdraft of 11000 would be played into my account the same day which was the 06/10/2018,till today nothing has happened and my quote expired,this is unacceptable and I want to know how and why.i am having endless problems with ABSA bank and am thinking of moving my business to a more efficient bank.i await a response from absa.