Sometimes, you can ask to be kept on promo rates. It works especially well if there is competitor you could switch to.
We were on $30/month internet connection for 2 years with one provider and reaching in August the end of our promo period. I researched prices for competitors for similar speeds and saw they were offering $30/month elsewhere and with my provider but only for new customers. I just called them saying I’d like to stay with them but not for $55/month which was our new rate. At first, they could not lower it to more than $45/month. Best rate they could do. Since I owned my modem and router, it told the rep it’d be no trouble switching to another provider if it’d save me $15/month and potentially get me on higher speed package. Then somehow they managed to find a way to keep me on my $30/month deal for another 2 years…
Just be a squeaky wheel and be ready to switch if they don’t budge.