I was called by Nedbank service desk about three months back on 20 th February to be exact and asked to change my savings account to a just invest account with the price of a good interest rate ,nobody mentioned that it's a promotional interest rate

I was called by Nedbank service desk about three months back on 20 th February to be exact and asked to change my savings account to a just invest account with the price of a good interest rate ,nobody mentioned that it's a promotional interest rate .over the three months the interest has dropped three times earning less every month .I went online and confirmed from their own website that if I consolidate two 200000 rand investments I had with them I should get 7.25 percent interest so I transferred the 200000 to the first just invest account I have ,it took 3 days to show and then this afternoon the interest dropped to 6.3 percent approx interest ,a bad investment ,I'm really not happy with the outcome