Terminix Warranty is worthless .. it cost my seller $5300 to repair property that Terminix warranted Ventura, California

I'm a real estate broker in Oxnard, CA.  My sellers paid an annual fee for 10 years to keep their home free of termites.  The service was to include any required treatment and repair of damaged wood.  When the buyers of this property requested their own inspection, the local termite company submitted a report showing approx $5300 of treatment and repair needed.  Terminix was given every opportunity to participate in corrective action, but they refused to act in a timely manner.  Not wanting to lose the sale, the sellers paid the $5300 to the other termite company, and the house is now sold. 

It has now been more than a month since the work was done, and despite MANY requests to Tony Beas (the Terminix branch manager), they have still not offered to take any responsibility for the work that was required.