It's telling that the constituency office for the Minister in charge of Child Pornography Dissemination - that is to say, the minister who is explicitly refusing to even endorse investigating Xitter over their generation of CSAM - is sending 100% of calls to voicemail rather than picking up the phone.
Call him, email him, badger him as much as you can to get the message across that anything other explicit and vociferous condemnation of CSAM is unacceptable, and showing even tacit support by continuing to use the platform is equally unacceptable.