Hunny nip this in the bud ASAP. I had the same with my now ex husband's ex. She'd ring the house fone up to 50 times, his mobile, my mobile and yes you can put on silent but when if your family need to get in touch (I was a carer for my aunt at the time) Anything I did she'd scream abuse. I had a party for my DD's birthday and got numerous calls ranting abuse how we could afford a party for MY child but not his (She never allowed access and we were always in court
)
It progressed to her making complaints to my employers over what I had said and done (or rather NOT as it was lies). They knew what she was like but have a duty to investigate.
After then she'd get friends to call at 2am calling me a slag and making threats of violence, even her own father was ringing me screaming abuse and when I lost my rag he was going "Oh yeah oh yeah baby, do it more" then HE complained to my employers that I'd shouted abuse at him!!!
I went to the police and any calls to your mobile can be traced in seconds. I gave them one example of a call and they printed out how many times that number had called. Landlines are harder to trace as you have to dial a number every time they call. Anyhow she got cautioned under the harassment act. Funny thing is that the police rang her to ask to speak to her and she thought it was me (like I'd ring her anyway
) and she screamed abuse at the police. They then turned up on her doorstep and said As I was saying Ms XXX
She's actually been warned 3 times in total as the paperwork was not completed properly and some other reason so if she does contact me again now she'll be arrested.
Dont let it escalate to that and it will get worse if you dont do something. Just ignoring her will let her think of other weird and wonderful things to do to you so sort it asap