Venns Attorneys can't provide me with the Invoice they say I owe.

If I could rate them 0 I would. I got an email from Venns attorneys saying I owe FlowPath Laborotory. I called FlowPath and I was advise they have no knowledge of me owing them. I emailed asked Venns Attoneys asking them to send me the invoice for the cost they say I owe (Invoice that FlowPath would have sent me). I even called the PMB branch, they keep transferring me to people who never respond. Their services is awful. No one can give me answers.