$250 not paid. Streamate says I didn't work but I did

Hey guys...i activates my account this year after 2 years of not using it ..I work for one week and streamate issues one payment from 2019 but did not pay the amount I got for the week I worked for in September. I sent them an email and they say I did not work that week. The amount is in my payment history ..one for referrals and one for my shows. In this case what do I do?
 
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