Complete mess around with billing

<p>I'm not sure whats going on with my Altech netstar account, but every month I get billed a different amount, when i queried this, which was also such a mission because no one could seem to help me, and I kept getting put through and cut off, with one lady informing she could only help me if I sent her my bank statement, why I would send my bank statement to a stranger is beyond me and why they couldn't see from their side what was billed is another thing. But eventually someone called me back an explained that the 1st amount had been prorata fee, and the 2nd month was the correct amount, I ask her if she was sure which she said she was, but she would double check and get back to me, no one did get back to me, and this month is yet again another amount. So if I could please get clarity on what I am suppose to be paying and what am I paying for because this is getting ridiculous, its even more ridiculous trying to get hold of someone to help me. </p>