Can I submit receipts after SARS has already done my tax for 2015?

I went to SARS and they did my 2015 tax. They said they owe me some money. But what I would like to know is can I submit my medical receipts and RA tax certificate still? I forgot to take it with me and submit them. Is it too late?

You would have to go back and do that if you forgot and request a correction.