Standard Bank doesn't care about their clients

Yesterday I called Standard Bank concerning my home loan which I have had for 5 years already. The home loan is approved for 30 years. I wanted to reduce the term intending to reduce it to 15 years. I asked them if this can be done and they said yes I can reduce my term but to my surprise they are not willing to resolute the interest rate which to me is a load of bull. The interest rate is linked to risk amongst other things and obviously me decreasing the term should lower the risk on their side. I am not a bad payer never missed any payments on any loan in my life but yet Standard bank doesn’t care about all that. They will rather let you switch to another bank than retain their clients but just reducing their interest rate. Standard bank doesn’t care about their clients they are just happy taking your money.