Excel pivot tables

I have inhereted the excel pivot table in orer to analyse and evaluate the date given to me. I am aware the date should be filled out in the tf operations data. On this page you put in all necessary data. I .e. Client, date, quantity, spec etc. Then you go to the necessary client you want to get data for i.e. Glencore. The you click on the liittle filters to adjust what you are trying to get out of the data. I.e. A pirticular quarter etc. Then you refresh. But this is not happening. Can someone advise.