I purchased pro plan but my account is stil on the free one.

Hello @rayane0408 

Buying the license doesn't allocate the license to any user automatically: You have to go to your portal and assign it (to yourself in this case).

Follow below easy instructions depicted in the Zoom Document:

https://support.zoom.us/hc/en-us/articles/115004976063-Assigning-Zoom-licenses#h_01GZCBPA9Y904KSEW5T... 

I hope it helps, and let me know if this resolves your enquiry.

Vinnie