OP, I work for Telstra. If you need my help, PM me. I'm not in mobiles, but I have an internal referral process that I can use.
However, it sounds like those with more experience (I have precisely none) have already chimed in. You will have screen shots of your call history and your outgoing call records in time.
It sounds like getting a reverse call record requires a court request rather than an internal email from me...
I imagine (hope!?) that if you turned up to court with the proof available to you, and then requested them to get the incoming records to prove beyond doubt, they might just agree it'd be a waste of everyones time to continue.
Happy to ask the questions though.
I don't think you'll need any, but good luck!