New Cable customer, already having terrible customer service

I just signed up for the double play package a couple days ago, and a tech came out today. When I picked my package, 2 days ago, I opted for the select package instead of standard for 1 reason and 1 station only. Select showed CMT. Well I found it was actually just CMT music, not the actual station. So I called and the rep explained I needed to add a package ($9.95). Ok, fine I added it, no big deal. I'll just drop back to the standard package to save that $10. I was told that package was not available to me anymore because I already signed up for the select, and I was not allowed to drop back to a lower package, due to no longer being a new customer. I literally just bought my service, and am seriously thinking about canceling already (I have 30 days) if I cant even get some help on something so simple because after 2 days I'm not a new customer. I really don't need 2 full years of dealing with that type of customer service. Yes, I should have been more diligent I guess, but the thought never crossed my mind there were separate CMT channels. Is there a way to speak to a supervisor?