Query still unresolved going 4th month

I am highly frustrated and dissapointed at your service, as I made numerous call to sort a pending query from November 2016, and I get when I call I get told it will be sorted, and will see adjustment on next bill, but no joy, I call ur call centre on Friday and many other times, asked for manager and then put on hold then get cut off..call again long hold then all managers meeting. ...please can someone call me urgently..regarding my query on line