Cases where the delay in property handover call for a full refund

Hi,

I am seeking advice on property purchase.

In 2016, I purchased a studio with a completion date of Q2 2018, for 500k, with 70% paid at handover. So far, I have paid 140k+21k registration fees. It has been over 2 years since completion date with no signs of it completing till Q1 2021.

Due to this delay, I would like to inquire my legal right if I were to file a case and request for a refund from the developer.

The SPA states in case of force majeure, they can extend the completion by 1 year, after which they have an additional year under the seller's remedy period.

However, I have not received an email stating a force majeure, therefore, I did not issue a written notice.

Although, I have sent them numerous emails stating that I would like to cancel my unit and get a refund, however, I have been denied this request. They had said all such requests sent by email do not count.

Can someone please guide me, whether I should file a case or not?

Thank you!