Unhappy Customer

I am an existing customer of Rentokil and I am very unhappy with their service from the start. They did their initial service and setting up in May and that was the first and last service. They were supposed to come out in June but no one pitched and due to this we are now having a rodent problem on our property yet they are sending invoices for services not provided. I am not supposed to be calling following up about when I can expect my servicing for Rentokil. I pay for services to be rendered. This is causing huge problems for our place of business.