CWI Maintenance review: Non-payment

CWI hired our plumbing business to go on an after hours/emergency call to one of their clients, Walmart #656 on October of 2019. We have completed a few jobs for them in the past and though it took a very long time to get paid we still decided to take this job. After nine months, several by mail invoicing, collection letters, emails, and phone calls we have sent this account to collections. Since then we have heard from several other contractors that they will not work with CWI or their affiliate, Coal construction because of the issue of non payment. As of now they owe us nearly $700 including late fee's.