I need help with my signature.

Hello! My name is Maria Luiza and I signed up for SIGMA a month ago to do a final project for college.

I signed up for the $5 plan because it was only for one job; my intention was to continue with Sigma for maybe another two months just to get to know its features.

But today I received a charge of $35 on my credit card, I didn't understand it and saw that I was enrolled in a Premium subscription, which totaled $35.

I would like to understand at what point this change of plan occurred, as I haven't accessed Figma since the academic work.

I would like to say that the $5 plan was extremely clear about the price, but at no point was there a clear explanation of any additional charges without apparent reason. 

Please contact me by email [redacted]