Hi ropend,
That's a very unpleasant way to start your day. You can't change her behavior but there are definitely things you can change in your own behavior. I agree with Deb. If she starts abusing you, hang up. You can also tell her that you don't accept her behavior and tell her in advance that you're gonna hang up, but like Deb says that's completely up to you. Sometimes it's best to just hang up the phone to prevent yourself from getting dragged into a drama filled BPD discussion. If she keeps calling, you can choose to not pick up the phone or indeed turn the ringer off. Caller ID can help but they can also mask their number of course but when you get continuous phone calls, you can be pretty sure it's her.
I got badmouthed through the answering machine.
I've learned the hard way not to accept calls from her till I know what mood she's in.
Problem is she fills up the entire answering machine with her BS.