Hi. I hope to cormfirm with you shortly but I think you can only retrieve the last vourcher using the selfhelp service menu. For vouchers from ealier than that, you'd need to phone their customer support number 0800 60 01 60 088 number. Because the number is not free from a mobile phone, it may not be worth the call at call. Edit: The above is confirmed and found through.
Signature: I (as a co-founder of this site) have offered online support since 2014 but have now (as of Oct 2016) given up my shareholding and am now with http://www.saroms.co.za