Deleting my TMobile Money Debit Card? Phone # i register with changed.

I ordered my debit T Mobile Money card  months and months ago bc of some AD saying how if I did so I would get 5$off my Metro by T-Mobile monthly bill if I paid with it… Well like I saod this was over 6months ago. I just don't need t anymore and want to delete the whole thing but cant get into my account because my phone number the one i registered w was stolen. What Now?