Return/Exchange

I bought a swimsuit for my daughter on Thursday 20/09/2018 and when i got home it didn't fit her, so i tried to return it on Friday 21/09/2018 and told they don't exchange swimwear. but it was not stated on the return/exchange policy. The swimsuit is still in the original state and still has the plastic protector but no they still refused, So I do not know what they expect me to do with it now... your service really sucks, I never have this problem at Woolworths... They exchanged my swimsuit with no problems, as long as it has the plastic protector.. I dont understand if you allow kids to fit the swimsuit in the store and put them back on the rack wheb they dont fit, why you cant exchange one the very next day.