Let me provide information on the error you got, mamta-yadav.
Error code 81622 when updating the billing information for your subscription might be caused by invalid account details or browser-related issues. Please make sure to check with your bank to see if you have the correct account information.
Follow the steps below if your bank information is correct.
Let's begin by accessing your account in a new incognito or private window of your browser. This way, we can check if this issue is related to your current browser or not.
Once completed, you can log back into your account and try to renew your subscription. If it's successful, you can clear your browser's cache to optimize it. Also, your browser can start from scratch and improve your QuickBooks Online browsing experience.
Here's an article for additional reference: Update the payment info for your QuickBooks Online subscription.
Please know that we're here if you need anything else.
I have tried this a gazzilion times and it still doesn't work. I am unable to use my account because your system won't accept my payments and neither allow me access. I can't even find a phone number to speak with somebody for help. Please let me know how do I get in touch with someone urgently.
I appreciate for performing the given steps above, @DVVALECHA.
I want to make sure that this issue will be taken care of. You can use this link to get in touch with our support team: Contact support. A customer representative will assist you further to identify what’s causing this issue.
Just in case the link for contacting support will not work, you can use this QuickBooks Test Drive. From there, click the Help button on the upper right to get in touch with our support team.
I've also added here some resources that you can check out about updating your billing details in QBO:
I'm always here if you need further assistance in reactivating your subscription. Have a good one!