Take the power back that you have given up to OM and the 'the phone bill'.
Realize that if she has many calls to OM on the bill then she's a doofus(tm) for acting so pathetically '17 years old'.
In fact, the more short calls there are, the more I would start laughing. Really!
My W had all kinds of 1 minute calls to OM and he rarely called her back. Obviously she was leaving a message and he was not calling her as much as she was calling him. What a teenager she was.
At some point you have to re-frame some of this BS and realize the 'dark humor' in it.
You are a much more powerful man than OM is because, well, you don't have to chase married women in MLC. What kind of man can't find a woman who is single and emotionally stable to date?
These OM's are all a joke. And sometimes it's even funnier when you take a hard look at the WAW and her behaviors in these situations.
You should read my thread, my W said some pretty wacked out stuff.