Undisclosed migration costs

I received a call on 2 October where I was told because I am such a loyal customer they want to upgrade my package for a lower fee. The new package was explained however it was not explained that they will charge me from 2 October where they already charged me on 1 October for the previous package. My account is now R 5800 where it was supposed to be R3200. Phoning the call centre is useless as apparently its an external company that does the migrations so there is no one who can assist me. I was given their number but its not going through. I was told my query was escalated just to fine out the next day nothing was done. I was then referred from pillar to post with still no results. My debit is due tomorrow and if I dont pay it reflects bad on my record due to Vodacom’s incompetence. They a bunch of *****'s that does not think about the client but just their own pockets. I’m very dissatisfied with the service and will not recommend them to anyone.