Contract documents that does not reflect our agreement

Fifth time in a row Standard bank keep disappointing me. Standard bank is blatantly ignoring my complain. I will not stop until this is sorted. I was offered a personal loan over the phone by one of standard bank's consultant. I specified the time period I wanted to at back the loan (36 months) and I was offered interest rates etc. which I agreed to. My loan was approved and the money was paid into my account. Problems started when I asked to see my contract documents and this request was blatantly ignored. After a month of complaining through standard bank, I complained on Hello-peter platform. Only then Standard bank showed interest in my request. I received my contract documents after which did not reflect what I agreed to. The duration was 60 months instead of 36 months I clearly asked for (phone records will show this). All I'm asking from Standard bank is to have my contract documents reflecting 36 months I agreed to but they keep sending me documents showing 60 months. After communicating to two of their consultants (Dladla, Sthembiso SP) and (Khanyisile, Dlamini), nothing has been done. I will not accept this kind of negligent and want my contract to reflect correct information. Standard bank is frustrating to work with. I wish they could just do what they suppose to do for their clients as a minimum.