Bad customer service

A Vodacom agent offered me a migration package at a cheaper cost, however when checking my invoice now that cost is higher. They send me the quotation via email that indicated that I have till the 5th of August to cancel or reject the offer. I have been calling since Sunday and everyday they are saying they are escalating the matter. Now when I want to cancel my entire contract, they send me an email that I have to pay for this new migration which I want reverses for the remainder of my contract. I’m so angry and frustrated with them because today I also found out that the other agents I was speaking with did not even escalate my query. I have been with Vodacom for morethan 13 years and it saddens me that our relationship will be forever *****ed because of this. I have all the evidence on emails to take this matter further and all the agents care about is giving me another package because apparently they can’t reverse that migration although I have an email that gives me till the 5th. I’m highly disappointed and would not recommend Vodacom to anyone anymore!