Did the guide who helped them have you as a reference on file?
This happened to us with a referral a few years ago. A co-worker purchased and mentioned us as the members who referred them. The guide did not put us into the system as the referring members under this co-workers information. Fortunately, before this co-worker travelled (I knew they were looking to buy months before they met with a guide), I called MY guide and gave their name as potential new members.
Only after my co-worker called her guide three times to try to make sure we were listed and were getting our "reward", and getting no where, I called my guide and she looked back at the notes she kept, and sure enough, there was my co-workers name as a potential new member, under my information.
Then my reward was processed. Call your guide too, if your friends guide isn't paying attention to this in an appropriate timeline.
Good luck.