Atrocious Customer Care service and negligence in promotional upgrade

Vodacom truly has the worst customer care, cancellation and upgrade service consultants. I recently called to cancel my contract on 13 May and was offered an upgrade promotional offer, for R279 pm, I would receive R390 airtime with 5Gigs data. This morning at 12:03am 1 June, my airtime was changed to R674 and all my data was removed. I spent 30 minutes trying to get ahold of a customer care consultant who then transferred me to upgrades who activated the 5g data and changed my data to R284 instead of R390. Bernice from upgrades hung up. I then checked my balance and realized the airtime issue. Called back, waited another 30 minutes, spoke to Siyabonga from Cancellations, who was rude and not helpful at all, just saying I need to call customer care. 1 hour and 46 minutes later, I am now speaking to Nthabiseng in Customer Care still trying to resolve this issue. Since when has Vodacom service deteriorated so badly and such sloppiness practiced in the upgrade of a contract. I am truly disappointed in the service and constant network failure. Please can someone contact me as I want a cancellation of this promotional upgrade considering today is Day 1. I truly am so disappointed being a brand advocate for Vodacom all these years. Right now I would rather try any other service provider except Vodacom.