School female classmate msging me alot

My school female classmate is msging me alot like she calls me always and tells me she dont like to talk to anyone else only me. She had crush on me in class 10th and she msged me after 2 years(now i am in btech 1st year) I have girlfriend since class 11th and i want to avoid that girl.......man shes annoying alot
why girls dont understand that if i am declining ur call and not picking them up then just shut up dont msg and call me.
I blocked her directly after 2 3 days of she msging me alot and calling every 1 hr for advices
am i correct?
I just dont want to talk to her but she is irritating I DONT WANT FEMALE FRIENDS
how should i tell her dont msg me or call me

edit:
i asked for advices and if not advices then someone can tell their opinion
cursing me wouldnt be the solution for my problem