Hello there,
We apologize for the trouble.
We would like to offer our help regarding this matter in our support forums.
Please open up a ticket in the support forum here: https://www.ads-software.com/support/plugin/mailchimp-wp/
There might be a number of reasons for the issue you are having so please open up a thread in the support forums describing your issue and we’ll be happy to help.
Alternatively, you can also mail us directly on [email protected]
Thanks.