visa prepaid card not working

I received my gift card 11/21 and since then I have tried using it online, at the gas station ( pre-paying for gas inside ) as well as other various stores. All have rejected by card. As of this point I have one month left to use my $200 gift card but after contacting the company about the status of my card they claim there is a block on the card and try back in 24hours. I did that with the same result. I attempted to contact someone at xfinity but with their automated system it its almost impossible to get anything resolved. I am certain my response to this will be to direct me to another automated system that will be another dead end. I just want to resolve this issue and get the $200 that was promised me when signing up for service thru xfinity.