Received a 2nd hand Wand Module

I purchased the Wand module for Hydrowise, and it was second hand, and wont connect with the controller as it's ''linked to another account''. Hunter say it wont work, unless the original owner de-registered the serial number. I called the mobile on their website *** but it says it doesnt exist :(

I have written to ClickLeaf via email and I am hoping I get a response. I if I do I will amend my rating accordingly.