Greenmeadows Video Ezy has no plans to close, says owner Kevin Knox.
News the building was for sale led some customers to wrongly think he was closing shop, he said.
He asked his landlord for less space in the building "and next thing I know he has got the store on the market".
He said he was unaware his fixed-term lease had expired and the business was on a month-by-month lease.
He lost his copy of the agreement in a house fire and his landlord had not informed him of its end.