The Terra Sana group, which has been going for over a decade, is suing the owner of the branches at Nueva Andalucia, Puerto Banus and on the Golden Mile.
Terra Sana claims he has not paid any of the two million euro asking price, since they were sold in September last year.
And since then, the founders of the green, health food-style chain, claim they have had at least 100 complaints from diners at the trio of restaurants.
Owner, Steve Sweeney, told the Olive Press: “It is really damaging our brand and it breaks my heart to have to go through all this. This is the worst time in the history of the chain.”
The American – whose parents have run restaurants in Marbella since the 1960s – has now gone to court to get the new owner out of the restaurants.
“He is not respecting the of the franchise, nor the look of the restaurants,” said Sweeney.
“It’s so hard seeing the business I’ve nurtured since day one, now being slowly destroyed by one man. We just want him to give us our restaurants back so we can start restoring our reputation.”
The franchise – which was set-up in 2000 with the concept of offering ‘healthy and creative food’ – allocates part of its revenue to planting trees and conferences in schools.