Bad service! Unhappy customer

I have requested an upgrade 50mb line since October, I was told the upgrade was done. Until this day I still have 20mb up and 10mb down package based on internet speed test. I was told today I have been active since mid October and I will be billed for the 50mb line at the end of this month. This is unacceptable, and I want to cancel. The person I spoke to this morning just dropped the call after I asked to speak to someone that can assist me with my issue. I work remotely, and my job depends on internet access. I wish I could give NO star!