I waited a couple of months and contacted support. They were very helpful. They said they had no record of the code being used but I showed them a screen shot off the text I sent (with my referral code) and they sent me the voucher. The other person ...
I didn't get the referral either from a few weeks ago. I made sure the person signing up clicked on it first. They are now using smarty, but neither of us have received any confirmation that we will get a voucher.