There's no such thing as a non withstanding clause in relation to our Charter. The federal governing party cannot change or amend the Charter.

https://www.justice.gc.ca/eng/csj-sjc/rfc-dlc/ccrf-ccdl/check/art33.html

Also

https://lop.parl.ca/sites/PublicWebsite/default/en_CA/ResearchPublications/201817E

The notwithstanding clause is a dagger pointed at the heart of our fundamental freedoms, and it should be abolished. Although it does not apply to the whole Charter of Rights, it does apply to a very large number of the rights and freedoms otherwise guaranteed. …

Clearly, then, it gives federal and provincial legislators very wide powers to do as they see fit in limiting or denying those rights and freedoms. The Charter would not have protected the Japanese-Canadians who were forcibly interned during World War II. Nor will it protect anyone advocating an unpopular cause today.

Perhaps none of our legislatures will use the notwithstanding clause again. But it is there. And if this dagger is flung, the courts will be as powerless to protect our rights as they were before there was a Charter of Rights.49

Finally, it is entirely possible to amend the Charter.

Most amendments can be passed only if identical resolutions are adopted by the House of Commons, the Senate and two-thirds or more of the provincial legislative assemblies representing at least 50 per cent of the national population.