✔ 最佳答案
The best solution to your case is to move and sue for damages and expenses afterward.
With a 2-year contract, your landlord breaches the contract and increases the rent by 30%. It basically means that your landlord is not a reasonable person and intentionally looking for trouble.
Since your landlord intentionally makes a trouble against you, moving out is the best method to avoid further problems or encounters.
Since you are forced to move out and the landlord breaches the contract, you can sue your landlord the following (as an example):
1. Moving expenses;
2. Penalty for breaching the contract (usually 1 time of your security deposit);
3. Rent difference for the affected period.
Under Section 15 (1) of Stamp Duty Ordinance (Hong Kong Ordinance Chapter 117), a lease without stamp duty paid is not admissible in the court. However, under Section 15 (1A), if the party commits to pay the duty and penalty associated, the lease will be admissible again.
Which one you want to do first (pay stamp duty and then sue/sue and then pay stamp duty) is up to you.