Fatal errors

Hi,
Sorry to post on here, but your website would not let me submit a support request due to its own errors.
Anyway, I have been experiencing many errors over the past couple of weeks and they keep tracing back to the Mailchimp connections on this website. I have had Mailchimp reconnect the account and I thought all the issue were resolved. However, I have just done a Zip Pay update and it completely crashed the website. I managed to get back in and identified this error;

This plugin failed to load properly and is paused during recovery mode.

An error of type E_COMPILE_ERROR was caused in line 46 of the file /home/mysite/public_html/wp-content/plugins/zipmoney-payments-woocommerce/zipmoney-payment-gateway.php. Error message: Cannot redeclare plugin_activation() (previously declared in /home/mysite/public_html/wp-content/plugins/contact-form-7-mailchimp-extension/lib/tools.php:172)

The error Log shows this;
[29-Aug-2022 06:41:50 UTC] PHP Fatal error: Cannot redeclare plugin_activation() (previously declared in /home/mysite/public_html/wp-content/plugins/contact-form-7-mailchimp-extension/lib/tools.php:172) in /home/mysite/public_html/wp-content/plugins/zipmoney-payments-woocommerce/zipmoney-payment-gateway.php on line 46

I have had to disable your plugin as we need Zip pay active, so hope you can advise why we are getting all these errors?
Thanks

The page I need help with: [log in to see the link]