Vouchers

If I receive an SMS voucher, will it have a specific reference number?

If I lose or delete my voucher, is it possible for the voucher to be replaced?

What if my voucher is giving me an error or is invalid?

How can I tell how long my voucher is valid for?

Will I get change if I buy an item which cost less than the voucher?

What happens to my voucher if I return my purchase?