Bad service in regards to a mis understanding on an loan

I ws given an option for a new revolving loan. It was approved for 141 000 upon which I accepted, only to find out afterwords that my current loan as increased and it was not a new loan. I imediatly tried phoning and the person said maybe I should try decrease the limit and see, but he will transfer me to a person to assist. Eventually I got through but the lady couldnt hear me and vice versa, eventually she just disconnected the line. I then tried decrease the loan which didnt do anything. I then went to chat online and they gave me a refrence and a week later after enquiring I was told in short its declined and they cannot do anything. I then asked if they cannot then at least take back the decreased amount and icreae it back to the initail acceptance and I was just said no. This is redicioulous and cannot believe that I received such service. I have never had any bad experience with FNB untill this