Family Dollar complaint: Family Dollar Employee

Individual complaint with a family dollar, employee. I’m a family dollar customer, and have been shopping @ one of stores(store 8786, located @ 321 W. Third Street, Marion, In 46952, have been for over 10 yrs, or more. The location is convenient for me, its only a 10 min. Walk from my location ,I will mention that I’ve been shopping their way before, this individual started working @ that location, (probably within the last year or so), anyway, Its his attitude towards me, ( only me, meaning whenever I’m in the check-out line, his attitude , does a complete 360, not mention the fact that he has ripped me off not once but, twice that I’m a ware of(for, example, charging me double for a specific item, the cigars that I buy there, ($1.84 before, taxes, $1.96 after taxes, add double to the $1.96. their was a couple of other items, as well, I’m not the only one he’s done that, too . has been verbally abusive towards me on two separate occasions, I actually, reported those two separate incidents to the store manager at that time, was told that she was going take care of it, apparently not. So, what’s the next step?