on 10-03-2019 11:16
It might, though only @sweet_pea knows anything about the relationship.
If it was to make is worse then she shouldn't do it. Though I know from personal experience that a threat of the police, often works wonders.
Either way, all the information needed has been given to the OP. Reporting it via O2, Talking to the police, blocking the number or even changing the number should put a stop to it...eventually.
Any abusive comments on FB should also be reported to FB and the police.