MyPrepaidCenter.com – Mastercard gift card

I activated the card successfully on the website but when I tried to use it to purchase a Dyson Vacuum, I received an error message. When I tried to add the card to my Apple Wallet as I've done with o other gift cards but, I received another error message and was advised to contact the Administrator. I tried calling the number on the back of the card and the service does include an option for this issue and hung up on me when I asked to speak with a representative. I have a $500 dollar gift card I received for my wedding and am EXTREMELY frustrated and disappointed. I am worried this company has scammed me and need help immediately.