17 years without a problem, but had tank cleaned t...

17 years without a problem, but had tank cleaned to sell house. (my mistake in telling them it had been 17 years). RP said because it had been 17 years since it was cleaned, a Crust Buster was needed. This is a weed eater with a propeller on the end. They used this tool for less than 4 minutes and charged $306 for it. Was also told much of the rest of the system needed replaced. I subsequently read an article on how a septic tank works and now I know why I've never had a problem. No grease, produce scraps, is ever put in the drain and nothing is ever put in the toilet that shouldn't be there. The bacteria did it job and the system just ran. Every conversation with RP was designed to scare me into purchasing additional services. They wouldn't honor the $149 cleaning price on the internet without the $306 Crust Buster service. I do not believe they spoke a word of truth throughout the job. Hopefully not all services are as bad as this, but look elsewhere.