Dic: give someone a dose of their own medicine

■ give somebody a dose/taste of their own medicine: △to do the same bad thing to someone that they have often done to you, in order to show them how unpleasant it is

• She's always turning up late for me so I thought I'd give her a taste of her own medicine and see how she likes it.

.... Cambridge Idioms Dictionary

■ a taste of one's own medicine (or a dose of one's own medicine)
Fig. a sample of the unpleasantness that one has been giving other people.
(Typically: get ~; have ~; give someone ~.)

• Now you see how it feels to have someone call you names! You are getting a taste of your own medicine! 
• John, who is often rude and abrupt with people, was devastated when the teacher treated him rudely. He doesn't like having a dose of his own medicine.

... McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.