The recent changes made by the PiS party, legal, media and others, were they all known by the electorate prior to the election as part of the PiS election manifesto
No, these changes were not known. There was no mention that PiS intended to ignore the rule of law, no mention that they planned to paralyse the Constitutional Tribunal, no mention that they intended to appoint endless ex-communists to leading roles in society, etc etc. As you say - the voters have been conned, and it's reflected in the way that opinion polls now put them on as little as 27%.
As I said, I'm not an expert on Polish politics but is it a case of campaigning to do A but actually end up doing B.
That's exactly what happened. The promises that PiS did make haven't been met.
I think security forces in Poland should deal with you.
Notice the threats of "security forces" by supporters of PiS.