Idp Ielts — multiple times declined even though I have sufficient funds

Address:

500062

I tried three times yesterday to book my ielts slot in idp, each time I complete my details and enter payment credentials it says a problem occurred while payment even thought I have sufficient funds. Card I used is international credit and also debit card issued by Bank of America. It would be great if this issue is resolved because the dates will be filled soon. Respond as soon as you can and solve this.