Misleading

I made an online application on friday the 13th November and an offer was made for me, a lady from the call centre also contacted me telephonicaly telling me to go to the branch to finalize my offer, I then went to the branch in Pretoria central on monday the 16th to do so, to my surprise a consultant told me that there was no offer for me and there was nothing she could do, my frustration is that why an offer online and gets declined in the branch, How do you run business like this? getting peoples hopes up but disappoint them on finalisation? I have always regarded African bank as the best for people like me, there is no doubt I cant afford a repayment of R600 pm.