18 month loan agreement but charged for 22 months

I made a personal loan at Standard Bank Parow Branch in March 2016. The loan agreement term was for 18 months.

I called the Standard Bank call centre today and was told that my last installment is in December 2017. How is this possible? My last installment was supposed to be September 2017.

I called the Standard Bank Loans Collections Department and advised them that I would like to dispute the contract term. I was told by the agent that because the loan was taken out at the branch, I would need to return to the brand in order for them to log the dispute for me. You cannot be serious? With the technology we have today, I still need to go to a branch to log a dispute and get a copy of my loan agreement. This is completely ridiculous as working people do not have the time to take off work just to go to a branch and sit there whole day. You want your money and I need to be at work to earn that money.

Please do not waste my time by telling me to go to a damn branch for a dispute that you could log over the phone.