Services and billing: very upset

This may be long, but there's a lot of detail:

I started an Xfinity Chat last night 8pm, asking to cancel my landline ($30) to save some money. Two hours and 3 reps later, I get handed off to someone on the phone; he was talking fast, couldn't clearly understand him, and he sent me a text link saying all I need to do was check the boxes, it was to verify my identity and my profile/account information, and he could help me. I did - and I didn't see anything in this link that said anything other than my identity and my profile/account information. With that sent, he quickly passed me off to another person on the phone, and she was very rude, overtalked me, wasn't listening to my concerns, because - while I was on the phone with her, I lost HBO, MGM, and some other movie channels. I asked her why and she said she could answer, and that my bill will go from 278 to 305! All I contacted Xfinity for was to cancel my landline. That's all! I did NOT want anything else to change. They canceled my movie channels, and did not cancel my phone.

Finally at 1am (yes, that's 5 hours), the 10th Chat rep finally typed "you will get original package back, and phone canceled," then abruptly disconnected.

I wake up this morning - phone still on, and no HBO or other movie channels. My current bill however, is back to what it was, and says that I DO have the movie channels, but I do not. They cut them off, and haven't returned.

I truly don't know what to do. I can't bare to talk on the phone with anyone from Xfinity, and be treated that way again, and can't go around being passed on to yet anaother rep every 20-30 minutes. Worried now that next month's bill WILL be the $305 the lady on the phone quoted. 

What for heaven's sake am I to do now to resolve this? This has truly been a nightmare.

Thank you for reading.

Alexandria, VA