Hi, I made a website for a client about a year and a half ago. We moved their old hosting to a new host, but kept their email/domain with the old host. Today I was checking something on their old host/domain registrar and saw that hosting was still being charged to their account.

When we switched over the hosting, I think the responsibility to cancel their old hosting plan got mixed up and I assumed they were going to do so.

So now they maintained their old hosting plan while also paying for a new one for their new website.

What should I tell them and how do i fix this?