Disappointed

The interest that they are advertising on their platforms is all lies! I got a huge shock, when I received a R6 interest for a R3000 saved in the goalsave account for 30 days. Their advert says from day 1 to 30 you earn 5% interest of the total amount that is in the account. I went as far as calling their customer service, I wanted to get clarity or atleast if they can give me the formula they are using to calculate interest because their app or website does not have a calculator. The lady that spoke with me over the phone, she told me, she cannot give me the formula but the R6 I see, is the 5% of R3000. To this day, I still cannot believe this. I was trying them out because a close friend had recommended that they have good interest on savings. I am deeply disappointed