Incorrect Interest app**** to Savings and poor service

Opened a money maximiser savings account back in 2018 and invested my life savings. After reviewing how much interest has been paid today I found it it to be far les than the 4% advertised on the website. After I enquire I am told the account was a money on call with 2% and not maximiser. One of the consultants mentioned in the call that my account was changed which means i have been **********. Who will pay back the interest lost? This plus private client issues has made me loose faith in FNB and has prompted me to move my business else where. To add to this calling has become a nightmare. I spoke to many different consultant after getting cut off a few times. Each time I try call in I sit and wait for a response only to be cut off at the 10 minute mark each time. If the above issue is not resolved I will be moving my family entire estate over to Discovery which has better interest rates.