If you didn't receive your 1099-MISC and there is no way to contact the issuer, it is possible that the form was never filed by the issuer. You still need to report this income. You can report it as a self-employment cash income. You need to know the amount, you might use your bank statements, checks, etc. for figuring that out. Even if it won't be exact amount, it is better than no report it at all.
You can learn more how to report self-employment income there:
Reporting Self-Employment Income and Deductions
