Brinks adt split

I was tricked into switching to Brinks from ADT under false pretenses, believing Brinks had acquired ADT. After learning the truth, I tried to cancel but was told I signed a five-year contract. ADT confirmed Brinks did not acquire them. Brinks representatives lied to me twice, but they insist I must pay over $1,000 or fulfill the remaining two years of the contract. I can’t find my contract details.