Need advice regarding the background verification check

I resigned from my previous job few months ago and now I have received an offer from a different company. I have been able to clear all the rounds and now the final round - background verification check is pending.

I have been asked to give the references of my previous managers whom I was reporting to ( need to give 2 names).

Now the issue is that I didn't leave on good terms in my previous company. I asked for an internal switch and they instead created a toxic environment and forced me indirectly to resign - which also led to a few situations where we had an argument. In conclusion, I didn't leave on good terms. Now how do I provide my reporting managers reference. Any suggestions would be highly appreciated. Thanks in advance.