EOS-CCA Continues to call me to collect a verizon debt for an account that does not exist although verizon advises all accounts are paid in full and none ever went to their collection department Internet

I am being harassed by rude people at EOS-CCA.  I have verified 2X with both Verizon landline and wireless companies that I owe NO money nor have I ever owed them money.  On top of that, both companies verify that the account number given to me by EOS-CCA does not exist!!  This is about to go into collection and the individuals at EOS-CCA are too rude to listen or even verify with Verizon any account numbers or amounts owed!!  If this company goes any further I am going to make it my mission to take then to court!!