Urgent :stop payment and get trouble,what should I do?

I made a STOP PAYMENT 20 days ago because I did a kind of facial treatment in April from a Chinese woman, but the outcome is very bad, there is two very sever scare left on my face, I feel very angry, I DO NOT trust this woman anymore and do not want to come back for further treatment. But I paid off $350.00 for all treatment fees one time because this woman told me she would guarantee the results until I satisfy. Although I did not trust her at all with what she guaranteed, I was not expecting the outcome much worse.
I called and asked my bank to make stop payment since the check still not been cashed out by payee after two weeks, Today, this woman tracked and called my office, she is very mean and threaten me such as she will call policeman and I will get trouble, I will have criminal record and so on.
I never go through this kind situation, could someone tell me the way to handle and solve this problem? Any kind of suggestion is highly appreciated.