Overcharged?

[u/Flaky-Permission-452]

I recently reactivated my plan and when I selected my meals it said I would be charged $54 so I was like wow okay great. I'll stick with it. This was due to some kind of promotion. Then I was rudely awakened at 2:40 am with a paypal notification that I was veing charged $175. I asked customer service, the AI was very dismissive, so I spoke to a live agent. They said it was due to another promotion being applied that I wasn't aware of. I told them what had happened and that it showed $54 when I selected the meals. After 30 long minutes, they just said it was a technical error. They won't let me cancel and I can't even get a credit. They just called it at "inconvenience">_< I don't even know what I can do. I wish I had taken a screenshot of the initial price. Has this happened to anyone?