Caller: Nbn internet provider

They called to say there were probs with my internet and someone was booked October 14 to fix. I said I only have mobile only. They asked for details and I asked them why they need it and she was going to put me through to someone else. I hung up. I then got 4 successive calls and I’d hang up and another number would ring. I left it to the answering machine and they stopped.

Here are the other numbers that called in succession, it was obvious harassment.
2.25 first call 0492 887 835
2.29 0436928237
2.29 00119347994782
2.30 0288063264

The last call went to answering machine and they stopped.