Mean Manager at Toys r us Mall of Africa

I went to Toys r us mall of Africa and my 5 year old son wanted to buy a piano with the money that he saved.When I got there I was told they don't take the coins which was the R 5 and R2 we tried to pay but the manager there said they do it take coins ,what if I didn't have any other cash ?.That is so mean to tell a customer infront of other customers that they can't take my money which was silver only .That's the worst experience wver