How can I contact CCleaner support

My CCleaner Pro is about to expire in Nov. I have always used pro since it does what I need. I get popups asking me to upgrade to ultimate for 2 years at the price of 1. I don't understand why after many years of being a customer they don't offer me a discount on pro?

I'd like to contact them and ask why not.

Thanks

Email...

support@ccleaner.com

Web support...

https://support.ccleaner.com/s/contact-form?language=en_US&form=general