plz some admin reply to this

I began this game when a friend 'dietsaregood' introduced it to me via the email link. Ever since I played this game frequently till sergeant major where I need 64 more crystals for M2 Railgun. However my friends showed me that the friend's referral email link does not work and he has not received any crystals at all. He decided to quit the game. Now the friend invitation clearly shows that the inviting friend receives crystals for each rank the invited receives. So in this case my rank is sergeant major so he should have received at least 100 crystals I suppose? However he hasn't received any. So I tried sending out my own referal link via email to my friends and just today I invited my friend 'BrokenMind". However I checked the icon with a dude and a plus sign and the invitation statistics still remain the same, i.e. 0 friends and 0 crystals even though the account was made through the friend link. Can you please fix this problem, admins of Tanki 'cause it is rather hard to get crystals for significant upgrades cause my parents never allow me to spend money on games and I have no money myself :cry:.