Recieved a gift card from my husband for mother's ...

Recieved a gift card from my husband for mother's day....for themes and watch faces on my phone. I had about $4.00 left on there, went to buy a watch face for $1.52.... kept declining??? Why?? Called the # on the back of the card, says there is a negative balance....how can there be a negative balance on a gift card??!! Can't get ahold of anyone! Isn't the 1st time paypal has screwed up with me, charged me for a phone I NEVER ordered, was arguing on the phone with me! Don't like them!