From now on I will record all my phone calls, just for my own safety. Just sad that you need to do that 2020.
That is actually illegal in Germany and may present a criminal act.
I have no reasons to believe that Lufthansa will 'scam me'.
I don't think that LH wants to scam you. A scam would require a bad intention.
The problem here seem to be that ticket was cancelled hastily on your side. You should have waited for some written cancellation waiver advise. A passenger cancelling a ticket is a very straightforward matter.
The issue is the subsequent refund process. If your original ticket was mostly non-refundable, the system would not follow through with a full refund. I was reading through your original posting, and I couldn't find any account on that you have gotten a written confirmation on the full refund.
It needs human intervention. As it stands now there was no explicit cancellation waiver in place when you cancelled the ticket. Hence, your refund request is keeping to bounce back again and again.
What you need now is some good will on the part of LH. With the current ongoing situation you may have to wait very, very long to receive that level of good will.
After the race got cancelled I called Lufthansa February 17th and at that time Lufthansa website was very confusing.
With the news situation on Feb 17, I think it was very easy to predict that the China flights in April are still to be cancelled by the airline.
You should have waited a couple of weeks, esp. if you had a mostly non-refundable ticket.