Hi there! Sorry to hear you're having trouble.
For payment inquiries, please contact AP-AdsExchange@twitter.com and the Billing Team will help you get your payment.
You can also block advertisers: https://dev.twitter.com/mopub/marketpla ... dvertisers
For the ad unit issues, reach out to support@mopub.com and the Support Team is happy to help you resolve your issues.