Telstra Wireless Broadband

Hi everyone,
I am with Telstra via wireless (i.e mobile network) for internet, as it is either that or satellite, and Telstra is the only provider that has mobile reception where I live.

My problem is I am paying $59 for 8GB per month, which I think is crazy pricing, I go over every month. Does anyone know of any internet companies that use the telstra network to provide the same kind of thing, hopefully cheaper? Or does anyone have a better solution?

Thanks heaps :)