RP Store Error

I bought Rugged Garen which it was 50% off and it took my RP as full price.
Do you know if this is just a "visual bug"? If not, can I get my RP back wihout a refund?

I took pictures as proof.

https://www.facebook.com/photo.php?fbid=943560029050137&set=pb.100001884476327.-2207520000.1444026802.&type=3&theater

https://www.facebook.com/photo.php?fbid=943559072383566&set=a.145951968810951.35526.100001884476327&type=3&theater