Does turning away from intrusive thoughts mean not paying attention to them, as if nothing was heard, and does this action imply saying to Satan, "Say that speech which leads to disbelief"?

Ignoring whispers means disregarding them and not caring about them. So, whenever Satan whispers, do not succumb to him; instead, turn away from him and do not dwell on it. Seek refuge with Allah from Satan, and continue in this struggle until Allah removes these whispers from you.