Correction of mobile num

I had an Imtiaz Card made, but I’m facing an issue because either there was a mistake from my side or the phone number was entered incorrectly by Imtiaz. My wallet was lost, so I went to get the card reissued. However, they told me that no card is registered against this phone number.

Fortunately, I have now found my wallet and the original card as well. I want to change/update my phone number linked to the card. Could you please guide me on how I can get the phone number corrected and update my card details?