We are very sorry your deposit didn't go through, but before contacting our support team, please try the following solutions:
1) Please contact your bank first, some banks block transactions to 'suspicious' sites such as gambling sites. The bank will know firsthand if there is something that's blocking your transaction to other websites.
2) There could be a browser problem, you can try clearing your cache and cookies, logging out and then logging back in. Alternatively, you can try a different device or a different browser.
3) You can always try a different payment method, such as ewallet services like skrill. Make sure you always double check which payment methods we accept before trying to make a deposit.
4) Sometimes a card cannot make online purchases/withdrawals. For example, cards issued for travel and entertainment purposes only. This decline comes from the bank and not jackpot.com and therefore, you would need to contact the bank for further information.