Unfulfilled Promises and Frustration at Vodafone

My contract with Vodafone for my postpaid line expires on August 21st, and I've been trying to contact them since August 4th. I desired to change to a special tariff. The representative informed me that the package would be renewed for 214 TL and would not be affected by any price increases throughout the year. They took my tariff password and told me it would be activated in 7 days and that if I didn't get a message, I should call again. I called again because no message had been left. They assured me that the process was still ongoing and that I would be notified when my contract expired. On August 21st, I called again, mentioning that my contract was about to expire that day and that the package had yet to be activated. This time, the representative stated that there was no record of my request. My request and the notes were visible to another representative. Despite the contradictory information, they assured me that the package would be automatically activated the following day. The 22nd of August arrived, but no message arrived. When I called Vodafone again, a representative stated that they had no record of my request and that I hadn't called them in a month. This was completely absurd. They insisted, despite multiple conversations, that I had not contacted them. They responded dismissively and disrespectfully after I pointed out their error. I requested to speak with someone else, and I was eventually connected to another representative who confirmed seeing my interactions from August 4th onwards. However, the subsequent days' calls were missed due to the initial representative's incomplete information entry for the package activation. They called me during this time, which was also unknown to me, and when they couldn't reach me, they closed the case, claiming I didn't have a request any longer. The new representative stated that they would submit a new request, but the price had risen. I made it clear that I would no longer accept this new price and the out-of-contract charges. I reiterated that I was not accepting the situation because of the representatives' irresponsibility and misinformation. The representative stated that they couldn't help me and that they would forward my case to the appropriate department. It's been 20 days of nonstop calls, and the representatives keep telling me that my case is still being handled. Why am I being blamed for this injustice? I will not accept this unjust treatment. I urgently request a thorough review of all call recordings, as well as a resolution to the issues I've raised throughout this process. I am adamant about renewing my contract at the package price.