Vodafone Misleading Customers

I wanted to switch to a new plan after my commitment ended via the Vodafone Yanımda app. First, it gave an error, but on my second try, it said the process was completed. But when I checked later, Vodafone hadn't made the switch. I called on October 2nd, and a person named A*** said they made a record. Two weeks went by without any response, so I called again, and they said A*** didn't create any record. Then, on October 14th, I spoke to C****, who created a record. To ease my doubts, on October 15th, I spoke to M****, who said not to worry about the bill, they'll fix it. On November 2nd, I called again, and they said they tried to reach me, but couldn't, and it remained the same. I have five Vodafone connections in my house, and I went through this much trouble for each one. I said, "This can't happen again," but it did. I switched to the Unlimited Mega package for 299 TL and encountered an error. Now, they say the bill is 604 TL, claiming it's at my request. Seriously, if I wanted a committed package, it's 400 TL - am I understanding this correctly, a 400 TL tariff becomes 600 TL in usage? I requested to listen to call recordings to see what was happening. It's most likely heading towards a legal case, and it's clear that I'm redirecting all my connections and those around me to other service providers. Enough is enough with what Vodafone is doing. If there's no resolution, I'll escalate it to the consumer court and legal action.