Caller: Woman with Indian accent

Asked about my electricity bill and that they could offer a 40% discount.

when called back it says the number is disconnected

Energy solutions

Disconnected when answering

frigging hateful annoying pricks.grrr

I told the (supposedly Indian?) woman on the other line to delete my number off of whatever register that it was on and she replied "oh no I will not and you will keep receiving calls!" before hanging up.......

No message left

I called back number (08) 6205 5022 rang once then gets disconnected automatically.