Investment scam

Quick back history. Invested a small amount in isa_investment. Realised fairly quick on it was scam and quickly changed my login details etc, then was quickly signed out of the trading platform, and not allowed back on. The company was investigated for fraudulent activity soon after. My account at the time had a significant amount invested in bitcoin (either fake or fraudualent) trading under my name. I have since been getting calls from various 'agencies' (anti money laundering to name but one) with more and more sophisticated tactics in order to gain access to my personal wallet, promising to help me deposit this cyrpto into my wallet, all the while watching through the use of 'anydesk'. My question is this: how do I find out if I have bitcoin, under my name that is transferable or are these just further scams. I would note that every call has been with the express purpose of transferring this bitcoin into my own personal wallet, not to extort up front payments. Has anyone come across anything like this or am I chasing a phantom? I feel like the good people at isa_investment are trying hard to get their money back.