AirG VIP Unauthorized charges on Sprint Vancouver Internet

Received a text on 5/26/16 stating airG:Welcome to VIP! $5/mo.  Call 8774654133 for help.  Reply STOP to cancel. I replied STOP immediately as I did not authorize these charges.  I immediately called the number provided and was told that I had agreed to terms and conditions (which I had not) but that they would reverse the charge.  I also contacted Sprint to inform that I wanted them blocked and that I suspected it was a scam because I did not authorize the charge.  Felt it was all resolved and today 5/27/16 received an identical text once again claiming that I had subscribed.  Once again called the number provided and was given the run around and told for the second time that no supervisor was available to assist me.  Also called sprint and was again told that 3rd parties were blocked from my number.  I am concerned because in researching it seems that this is a VERY common situation between Sprint and AirG.