Visa Support Letter

I tried to gain a visa support letter using a US credit card but when doing so the application told me I needed to contact my banking instituttion. to authorize payment. Calling the bank they said they had no information concerning autorization.
I received an email confirmation and “go to payment”

Q: The visa is for a double Entry visa and I am applying for a 3 year visa. Will this apply as well?
Q2: I applied for a given hotel. It is my understanding that I do this is not a reservation correct?

Thank you
Lou

@Lou Try with another card.
Yes , you can apply for multiple 3 year visa.
Correct, is not a reservation