we live in south carolina. in 1997 we signed a contract with a local company for termite protection. the contract states that the comapny will extend protection to us for $100 per year. if they should find further treatment necessary they will perform it free of charge. a couple of years ago they sold their company to another local pest control service. i have just been notified that we are due a booster treatment (due to changes in the materials now being used). this treatment will cost us $395 and we must sign a new contract with this company. do we have to pay for the boostre treatmetn and sign a new contract?