Respected sir/ madam,
I am writing this email with the utmost respect in order to bring to your kind information that I have received an email from your end stating that I am eligible for upgrading my credit card account i.e. _____________ (mention account number).
I am currently using the credit card ______________ (name of the credit card) and I am eligible for __________________ (name of the credit card). I, therefore, request you to kindly upgrade the same. I am ready to proceed with any required formalities in this regard.
Thank you so much,
Regards,
[Digital Signature – if applicable]
____________ (Signature)
____________ (Name),
____________ (Contact details)