As your employer is now asking you to leave earlier / immediately even though you were already serving notice, your employer should pay you salary in-lieu of notice (‘notice pay’) for the rest of the notice period.
You should receive your final salary on your last day of work or within 3 working days from the date of employment termination.
The Tripartite Alliance for Dispute Management (TADM) handles salary related claims and disputes on employment termination. If your employer did not pay you, you can visit TADM's website and tap on “ASK TADM” chatbot advisory service for assistance.