Over billing

I got a statement for August's bill but when I check my statement for July it doesn't correspond with the one I just got so I decided to go to Telkom eastrand mall to query about why I was over billed they called their offices I spoke to Sanele khoza but still he couldn't give me answers why I was over billed he had nothing to say he just told me im not the first customer to complain about being Over billed so honestly I'm disappointed with Telkom as their customer they are taking us for a ride honestly even when I check on telkom pay online it doesn't correspond with the statement so Telkom need to fix this problem before they debit for this subscription ***