Poor service

On the 12th January 2022, I invested R100000.00 into 32 day notice, and I opted to invest for 6 months and expected to gain an interest of between 5 & 6% as it was explained by the bank consultant. Last week 4th July I went to enquire about my investment, I was told it matures on the 12th July and money will be deposited into my account. Today my funds were deposited, to my surprise, money was deposited as is, no interest whatsoever after 6 months. I guess I could have put it under the mattress. Useless investment. Can I get an explanation. I'm going to invest my money, going forward. I wasted my precious time.