Intec Select interview questions

Intec Select contacted me and told me they were sending my details to their client. 2 days later another agency called me about the same role, so I told the agency that I had already been submitted by Intec Select. When they checked with the hiring company, the agency told me that Intec had not sent them. When I contacted Intec to verify this, they have never replied. The new agency got me an interview with their client but don't trust Intec Select. This sort of beaviuor needs to be called out