The Ima Boss hitmaker posted pictures of sports cars of Instagram.com earlier this month (Mar15) warning fans against buying vehicles from Euro Motor Sport, Inc. in Fort Lauderdale, Florida.

Owner Gene Morales tells TMZ.com that Mill wrote mean messages about his business in retaliation for a recent argument at the store, where police were called to resolve a bust-up over money the rapper owed on a car.

Morales has issued a letter to the hip-hop star demanding he pay $250,000 (£156,000) to cover damage to the store's reputation, delete the posts and publicly apologise for his comments, otherwise he will be hit with a lawsuit.

Mill had not removed the Instagram posts as WENN went to press.