Updating login email address

Hello I have been trying to update my login email address to kelly.souris@hellosmile.co.uk but when I change the email address, it says "changed successfully". There is a "verfy email address" email sent to kelly.souris@hellosmile.co.uk  but when I click the link to verify the address, it says "link not valid". 

Now when I go in to my settings, it says the email address on the account is kelly.souris@hellosmile.co.uk but that email does not work to log in. Also my old email address still works to log in (severn@claritysmiles.com)

Please help me change this! 

I see that there is no account associated with the mail address severn@claritysmiles.com. However, there is an account with email address kelly.souris@hellosmile.co.uk having username HelloSmileLtd. Could you please confirm that this is your account?

Yes this is the account. But you’re system still allows me to log into the system when using “sign in with gmail” and i use severn@claritysmiles.com
When I tried to use “reset password” for kelly.souris@hellosmile.co.uk it would actually end up making me a new account
Sent from my iPhone
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As far as I can see your email address is successfully updated. Could you please try login using another browser and see if it works?

Also, follow this guide to reset the password: How-to-reset-the-password