Card details incorrect and Card declined everytime i try to buy!

[#1]

Im having the issue where after entering the CORRECT account details into giffgaff and clicking order and pay i am getting either

"Due to your payment being declined by your bank we haven't been able to process your purchase. We suggest you contact your bank to resolve the issue. Alternatively, you can retry with a different credit/debit card."

or

"The card details you have entered are incorrect. Please check that you have entered the correct card number, CVV, card expiry date, billing address (Where your bank card is registered) and card type."

This is extreamly frustrating as i have tried everything from clearing my browser cache and cookies to trying it on a different device.

I have followed Every sep detail in similar issues on this forum but i still get the same errors with the CORRECT details being entered every time.

Many Thanks

[#2]

Hi, contact the agents at
https://giffgaff.com/support/ask/cant_topup_airtime

[#3]

@jackberwick, hi there, try logging out then empty cache then log back in and try, if still having problems contact an agent as they might of flagged the card 💳 for security precautions.

https://giffgaff.com/support/ask/cant_topup_airtime
Agents can take upto 24 hours to reply but are normally quite quick.   https://giffgaff.com/support/questions
Please take a look at this.

https://community.giffgaff.com/t5/Tips-Guides/Credit-Debit-card-Issues/td-p/3621481

[#4]

Already tried it but it asks for a vocher code that i dont have

[#5]

@jackberwick, hi, contact an agent here.

https://giffgaff.com/support/ask
Agents can take upto 24 hours to reply but are normally quite quick.
https://www.giffgaff.covm/support/questions

[#6]

When ever i try to contact an agent i am propted to enter a 16 didgit voucher code which i don thave because i am trying to buy a phone not top up