Denied extra funds that I paid to my bond,even when I had access bond on the account.

I have a home loan with standard bank. It is left with a year to be paid up. The monthly payment was calculated and I never missed a payment.I had access bond on the account. Now I had a windfall and decided to park the money on the bond knowing that I will get it to pay my other accounts when I needed it. Standard Bank refused to avail the extra funds I paid in.This came as a shock because I had access bond.Their reason was that it is the final year of the bond hence the lump sum I paid in will not be released.I engaged the ombudsman but that did not help.I am a very unhappy customer and reading the reviews on this bank,proves my point that one need to be very careful when dealing with standardbank!!! I have given up.