Pressured into accepting a "Free" iPad, now paying more than I was before, with threat of charge for iPad if I cancel?

In July I was trying to understand why our bill was going up every month, despite no change in service- we had unlimited internet only. I asked via the Xfinity Chat service. Agent told me it was because my promotional rate ran out. I asked for a new promotional rate for unlimited internet ONLY, considering ours was increasing each month and had no knowledge of it.

The agent then also told me I was being charged a fee every month for equipment we had already returned MONTHS previously-Credit of which I have not seen or heard of yet. They said they would make a ticket for me, in July, but I have still heard nothing about it. 

The same agent then told me the only way to get the cheapest price for unlimited internet was to accept a free iPad. I asked multiple times to confirm it was free, as I did not want or need an iPad, which i also told the agent multiple times, even asking if I could do this deal without accepting the iPad, and was told no. I felt extremely pressured into accepting it, as the goal in the first place was to save money, and that's what they claimed this would do.

I just found out I am getting TWO monthly Xfinity bills, my credit has gone down, and I am paying more than I ever have for internet because I now have a mobile plan that I was unaware I was even signing up for. 

I asked in Xfinity chat today if I could cancel the mobile plan, considering I didn't sign up for it. The Agent that if I cancel the mobile plan that I would have to pay for the iPad in full. I asked if I could return the iPad since I didn't realize it would cause this, and she said I missed the return window- that I didn't even know existed. The iPad that I essentially begged to not have, and do not even use. I got a call from an agent who said they would submit a report for me but I am not confident, given what happened the last time I was told a ticket would be filed I heard nothing, and was simultaneously scammed into a "free" iPad and mobile plan.