Change of email problem

I have changed my email address because my service is now discontinued (Microsoft acquisition of Nokia). My problem is Zoho is sending a confirmation message to this now discontinued service and therefore I cannot verify and thereby change to a new email address. How can I do this? Nothing I've tried appears to work. Every did work OK before and I know I should have changed this while the service was still operational, but this has caused me unnecessary inconvenience. All help appreciated.