Product: Debt collection

I have been with XXXX for 14 years. Years back I fell into hardship and had some late payments back then, but I caught up and have been very current and on time for quite a few yrs now to the end. I believe it was in XX/XX/XXXX I had decided to go with another carrier who could give me the exact service XXXX was but instead of charging me {$270.00} a month it would only cost me {$80.00}. I am XXXX and can I can not afford their ridiculous charges anymore. As of that date my account was current with XXXX. I had tried to sign on to my account as Im at the store dropping XXXX n getting a different phone service. The woman had told me that I needed my XXXX account number. So I try to sign on to my account was unsuccessful so I had called them answered all the security questions so the gentleman on the phone helping me said hold on a second it's pulling right up and he must have heard me speaking to the other phone lady that I was standing there with, and then he says why do you want this? It's said because it's my account number and I want it. So I got bounced around to several people I was on the phone literally for 2 hours the woman in the store even tried calling them to get the number they kept giving me wrong numbers hanging up on me. After the phone store that I was in had closed and I'm still there. she stayed at the store for me although she had it all locked up and was nice enough to wait till I ran home to get my XXXX account number period after being on the phone being tossed around for 2 hours with XXXX. So as I'm heading to my house someone from XXXX calls me and tells me he's going to save me {$70.00} if I stay with. I never mentioned I was leaving them for one so that was me indication that they did hear me speaking to another phone person and two I had asked the gentleman why can't you save me {$70.00} when I was your loyal customer? No answer and he precedes to finally give me my account number. I went back to the phone store got my new device and account with a different carrier and I cancelled XXXX. 
At the end of that month I received a bill from XXXX for I believe it was on or around {$270.00}. I don't remember getting any bills from XXXX in between that bill and the last one I received dated XX/XX/2018 for the amount of {$1200.00}. I very well may have but I was in the middle of moving and had my dog put down and just a lot of stress and upsetment in my life, they were the last thing on my mind. Then I received another bill for from their collection. I think it's unfair I think they bully people in overcharge and this bill is outrageous. The woman at the store said that several people have been having problems with XXXX because everybody 's leaving them because of their high prices and they're doing everything even if it's refusing to give you your own information to get people to stay with their company. I feel like this company is Relentless and they'll just keep firing out their bills and turning people into collections and in hopes people pay their that much further ahead it's highway robbery. And I don't have 12 - {$1300.00} in order for XXXX to rob me more for services I did not even use. 
Thank you