Credit card

Please help me with this..
I have came out from Saudi with final exit in 2018..after two weeks in m home country I'm in need of money and I have used sabb credit card and done around 700sar shopping. after 1 month I think my iqama expired and online banking and credit card also not working. Now I'm in another country I didn't take any step to Pay that due amount I used from sabb credit card. I forgot and no idea how I can pay that money B'cos online banking also closed. I have no idea to go back to Saudi. But 2 month before I got a mail  Like this " 'Dear Customer,
We kindly ask you to pay your due amount to prevent the referral of your case to the concerned department for legal action
Please leave your phone number to contact you."
Is there any Issue for my future.or how do I know my due amount and how can I return this. its more than a 1.5 yrs after using.
Anyone can help me with this

Pick up the phone and call the bank.  They already asked you to provide your phone number so they want to talk to you.   Reply to that email at the very least.

Yes there will be issues in the future if you ever go back to Saudi.