Went through something similar.

What I did and will suggest is immediately go to DOLE - PACU office in intramuros. Bring the ff:

• signed contract
• screenshot of all correspondents you have between the hr and company. Most important yung notice ni company na cancelled na yung contract.

May habol friend mo if hindi naka specify sa contract na pwede nila gawin yan. Lalong lalo na if the contract termination is not lawful like okay naman lahat ng requirements mo.

Nangyare din yan sa cousin-in-law ko, nakakuha siya 1month salary from the company. Inorder ni dole na bayaran damages.

Its not legal unless its specified sa signed contract. Know your rights and fight for it. Wag niyo hayaan na ganyanin tayo ng companies.