Unless they noob (which I won't be surprised) there will be clauses that allow them to adjust the term and conditions that will supersede the old terms.

You signed loan agreement to buy a house, but the monthly repayment also changes if the BLR is raised right?

The borrowers have the option of immediately repaying the debt. If a normal business raise the interest to 200% this year, what you can do is go take a loan from another business at 6% and settle it. So yes, they can do it and they won't, because it will kill their business.

However, PTPTN is not meant to 'generate' income per say, so they can do it.

Sohai mak kau
I follow contract la . Apa salah