Incorrect billing and do not give feedback

I upgraded in May 2017 via the website and was notify per e-mail from Vodacom of my new monthly amount due each month.

The 1st month I received my new bill, I was charged an upgrade fee, even though in the e-mail I received stated that no upgrade fee are payable. Ever since May 2017 to date, I have been struggelling with my account! They bill me more than what is stated in the e-mail received from Vodacom in May 2017. No they even block me due to "being in arrears" even though I pay timeously every month the amount per e-mail. This is a top-up contract ....

I have logged a number of queries with Vodacom and NOT ONCE did I get any reply! I even mailed them their own e-mail back with a letter explaining everything and still NO RESPONSE! When you phone them, you get shifted from one person to another person, but no one is able to assist!