@pksmalls - do you have any other accounts that could be connected to this credit card?
If not, you could issue a chargeback on whatever transactions from Public Mobile with your card holder.
But, I would also submit a ticket to CSA, asap, to let them know this, and have them remove any card of yours from their system, if it is not used for any current Public Mobile accounts.
Contact Public Mobile Representatives (CSA) by submitting a message(ticket) to them here:
Private Message to Public Mobile Customer Support Agents (CSA)