Telkom Billed incorrectly

<p>I had a telkom adsl bundle with a 2mb adsl line.i had phone the telkom sales department to ask dem if i may upgrade my speed on my line.and they did tell me it is possible.so i agreed with the price aswel.which was R780 a month.2day i recived my statement and it show me an amount off R2198 payable due to a cancellation off line.this is putrit service as i call in to the department off sales and enquired abt the proccess.and this is the second time that dey over billed me.can sum1 help me please.</p>