You can use CRED, Paytm, Amazon Pay, and PhonePe to pay for your credit card bills, and these provide good cashback rewards, discounts, and offers on various brands that you can use later.
Contact your bank or visit the bank. Check the status of your account, like whether your contact number is updated or KYC is done. May be your account is frozen. And tell them to unfreeze the account. Just do some transactions (deposit some cash), and your account will be operational again. Then try to link your bank account to GPay.
