Unresponsive Company

I have had an account with Chubb now for roughly 3 years. In May a new tenant, moved into my home and transferred the account onto his name. I called the call center to inquire regarding the procedure and I was told that my tenant just needs to sign a contract with Chubb. According to my tenant, this was done and he paid the account during his occupation. In September the tenant moved out and a new tenant moved into the house and once again transferred the account onto his name and according to the new tenant, he is also paying his account.

During all of this time, thus since May, my debit order still went through and I have been, effectively, paying the account as well.

Thus Chubb has been receiving double payment for the same effective account. I would like to know when Chubb will re-reimburse me and cancel the debit order. Remember I was advised that I don't have to do anything by the Chubb call center.

I got hold of the accounts department that said I should send an e-mail with the above instructions for contract cancellations, however the e-mail address does not work

Also, please note that Chubb's contact page on the internet does not work since I received no response from my numerous submissions on this platform.