Gic Housing Finance — loan no : up[protected]

Sir i have given home loan of 2400000
At june 2018, till now i m paying my monthly installment correctly, recently at dated 28th of january 2019, i have paid 500000, against loan no : up[protected], for reducing my monthly installment, but after receiving amount of 500000, they r not responding. Again i suppose to pay same installment
I have tried every mean but all in vain, they r not responding, i have words with their employees mr vikash and mr subhash
Both r making excuses and ignore my mail my phone and my sms, plz do needful asap