Coworker

Has anyone had a problem with being falsely accused at work? I have two female coworkers that are always in the supervisors office complaining about me and saying that I have sabotaged their belongings. They can never give me a reason why they think its me when I confront them. Instead they get really uncomfortable and embarrassed then they say I attacked them to my boss. The worst part is that my supervisor believes them and is going around asking everyone what I am doing while on the clock. I am at a loss...