Vodacom does not value their clients

I have been a customer of vodacom for many years, and have always sang their praises of being the best network, that was until they billed me on the 1 July 2018. I app**** for a package migration on 7 May 2018, The consultant that I spoke to said the migration was free as I was within my upgrade period, and I will be paying R120 from the first of July 2018. I asked her numerous times are you sure the amount you giving me is correct and everytime I ask she said yes, that would be my total bill till the end on my contract, which is 31 August 2018. The reason for the migration was because I was intending to take out a data contract, and the price of the migration was going to determine whether or not it was affordable for me or not and at R120, it definitely was, as the data contract was R149, which meant I was supposed to be billed R269 on 1 July 2018. Now 1 July 2018 came and I was billed R408.57. So I called in to the Vodacom call center, only to get transferred from one person to the next having to explain the same thing to I dont recall how many people, eventually someone told me, we need to request the recording of the call and get back to you.... I'm still waiting... and its the middle of August. Well I didnt wait... I called back a few days later... and the same process again, being transferred, and having to explain the same story because every one at vodacom likes listening to your issues but no one there does a damn thing about it, again im told we have to request the call recording and get back to you, and still im waiting, then a few days later, I go through the same process with the same response, so I decided to hell with this pathetic excuse of a company, I'm cancelling my debit order, and im not paying them a cent until they sort out my bill. So yesterday, 12 August 2018, I decided to call again, but this time to cancel my contract and im told your bill is outstanding we cant cancel your contract, so I go through the same process again with one change, every brainless employee of vodacom I spoke to seems to give the same scripted answer, its like they trained to answer you with the same answers without listening to your query and as soon as your query is not on the script, they dont know how to respond, and its amazing how there is never a supervisor or manager around when you request to speak to one. So after being a loyal vodacom client for I dont recall how many years, I refuse to deal with this company anymore, and I refuse to pay them a cent until my bill is sorted, and I refuse to take out a contract with vodacom after my current running data contract is done. I will be changing my service provider as of 1 September 2018.