Billing more,more&more each month

I took out a package for home unlimited wifi data with landline in february which only started working in march/april this year, it was supposedly on special for R299 for 6months thereafter it would be R499. The funny thing is from the first statement my bill was NEVER what i signed up for,it was ALWAYS R400 and something like very close to R500.

Now the scariest thing is,HOW MUCH AM I GOING TO BE BILLED AFTER 6 MONTHS??? My bill for AUGUST is already R660 like HTF did TELKOM get to that amount??? Whats next???!! Am i gonna be bille R1k by DECEMBER?? Someone please explain this ASAP!!!!