Best way to model a chart for a customer usage data

[Saravanan D]

I have the following data to be represented as a chart,

customer feature month usage


a1       f1       jan  5


a1       f2       jan  6


a3       f1       mar  7


a4       f2       apr  8


a5       f1       may  4


I tried to use bubble chart, but I am not getting the right one as the bubble chart looks good, but my data considers a feature as a string and I also have only 1 numerical column, though the data to be compared is having 4 column.