Paid for items but received no receipt

Today i went to Mr Price in a long time. Firstly i was not greeted by the consultants. They ringed up my purchase and told me to enter my email address. No reason was provided for this. They just gave me my slip from my debit card and said they will email the slip to me. Its an hour later and still no receipt. I got the shoes but did not fit it on as i was in a hurry. What will happen now if i need to return or exchange it? The way i feel now is that i want my money back and you people can keep your stuff. The first time i hear **** like this were they will mail you the receipt. Or are you running low on paper. Utterly disgusted will never ever shop at Mr Price. By the way i want my slip ASAP cause you took my money ASAP and this thing of emailing a receipt is not going to work for. I need answers!!!!!!