Developer Demanding Permission for Recurring Repairs and Issuing Threats

I am the owner of a flat in a residential building where the below flat is facing water leakage issues. This problem is due to the developer's improper construction work, not any fault of mine. I have already allowed the developer to conduct rectification work twice, with each instance taking about a month, yet the issue remains unresolved. Now, the developer is demanding further permission for repair work but has failed to provide a permanent solution in the past. Additionally, they are threatening to stop my access to essential facilities such as courier services, maid entry, and other amenities if I do not comply. 1. Is it legal for the developer to issue such threats and deny me essential services? 2. What are my rights as a flat owner in this situation? 3. Can I hold the developer liable for the recurring issue and demand a permanent resolution? 4. What legal steps should I take to address these threats and ensure that the matter is resolved appropriately without further harassment?