Incompetence and breach of contract

Upgraded my Internet 3 months ago, been paying for 10mbs line, only to never receive what was promised to me and not getting the speed at all. They charge you for 10mbs but I only get 5mbs, how pathetic is that. Also their call center promised me all the bells and whistles but I have received nothing, just get charged for something I am not getting. Asked for the recordings 3-4 times and they ignore it and offer me an android box which I was supposed to get when I upgraded, how stupid do they think their clients are. Told them to cancel the contract, which their call center already canceled, then they want to threaten me with penalties, but it was their incompetence. Nobody takes responsibility for their work or incompetence and they just keep dragging you along to get money from you.