Bogus billing

I received an invoice and to my surprise it was for R451.18 instaed of R259/m, while I was not even using their simcard, cause when i wanted to use it after a long time I couldn’t access my social networks and I even called them, telling them that the sim card is useless and they even gave my sitting directions saying that my settings is not right, but still I had no access. I even bought airtime on my Mr Price account and RATHER used that for a day.

And what is worse, I’m asking them to forward me a billing usage and they say they can’t cause I didn’t ask them for activation before and If I want them to activate it they can do so and I will receive billing usage going forward at a fee of R36 per month.

Please help!!! I think I’m being done in here.

My account no. is MRP **********