Problems in coping with my PhD Supervisors
I would suggest you to write a preliminary research findings report to both of your supervisors.

In the report, explain what you have done in the past two years. State the facts. Don’t point the fingers.  You describe what you have tried and why they failed. Don’t make it too long. Refer the details to the notes and the data stored somewhere else. The final section of the report is your plan to tackle the problem further.

The purpose of the report is to let them be aware of the efforts you have spent. It documents the lessons learned. With the report, your supervisors and you would have more understandings about the problem you have been working on for two years. Bear this in your mind, it is likely you would know more about the problem when you write the report.

The report will answer their questions, Are you really interested in your problem? Yes. you wanna leave the course? No. But you need their help to finish it. If they tell you they can’t help you after they read the report, then it’s time to either change the research problem or find yourself another supervisor(s).