After 7 months I get a bill in the mail for my bre...

After 7 months I get a bill in the mail for my breast pump, after being told it was covered by my insurance. After inquiring about the situation they tell me my insurance was inactive at the time the pump was sent... My insurance was not inactive and they didn't even have correct insurance company! Talking to representative was completely useless! The woman told me to call my insurance company, no resolve, just brushed me off.