happybirthdaytoyou.com Asked for all relevant information name email address name of recpient of birthday card. at Pay Now recieved error message after giving credit card number. United Kingdom Internet

Submitted all required information to send singing birthday card to my son on June 30th his birthday.gave his email address as well as my own to company. After entering all information asked for I was asked for my credit card number, which I submitted after clicking the Pay Now prompt a message immediately came up that stated there was an error in transmission. I called telephone number given and person stated there was no one available to answer my call I also sent email to email address given and have not received a reply. I am sure I will be charged and do not like having my credit card number given to an untrustworthy company. Is ther anyone who can tell me if I must deactivate my card?