Vodacom Bullying customers

A few months back Vodacom decided so suddenly bill me large amounts. After multiple calls emails and messages, I got through to Vodacom and was ignored. Only after my Hello Peter complaint about the ***** from Vodacoms side was I answered ans assured that my dispute was sorted as Vodacom realized that the mistake was on their side. Vodacom assured me that the funds will be corrected and that I would regain use of my accounts, as I have been paying them. This brings me to this month. I received a bill from Vodacom with the monthly amount which I am happy to pay, but I also receive a additional invoice that shows I need to pay extra. I ignore this as I was made aware that Vodacom sorted the dispute and would reverse all funds as per multiple conversations with a representative. Now Vodacom threatens to cut of my line if I do not pay, this is bullying as I will have no choice, I should either pay for Vodacoms incompetence and lack of honesty or i should sit with no connection.