Contact 48 support.
See the link in my signature below.
Hope this helps.
I had the same problem, when i contacted them, they told me to share their name, email, mobile number and mode of payment. The thing is, I shared my referral in 5-6 whatsapp groups and i don't know which person joined it. I just know his name because it was mentioned in the mail, rest i don't have any details. Are these guys giving any free credit or just fooling us? WTF! The customer care guy just ended the chat without any response, ridiculous!