My roommate blocked my devices from the wifi. What can I do?

English isn't my first language, so please excuse my broken English.

I have lived with 3 current roommates (A, B & C) since August.

Roommates A and B have been living in this place since 2021, so both utilities and wifi are under their name & everyone Venmo them the portion of expenses.

I had an internship from January to mid-March, so I wasn't at the apartment from mid-December to mid-March. All my roommates were aware of that, so we already agreed that I didn't have to pay for anything but rent for Jan and Feb.

When I got back in mid-March, we had multiple arguments, and roommate A, who was responsible for wifi, blocked all my devices from the wifi.

Since I already paid for the March wifi, I asked him to either unblock my devices from wifi or give my money back, but he said the payment was for February (when I wasn't even there) and he won't be giving my money back. I called customer service, but they said they can't do anything without the security code, which only roommate A knows.

What should I do in this situation?

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p.s. Just in case people tell me to try to have a conversation with him, he already cussed me out, locked me out of the apartment, and possibly turned my electricity off (breaker box). I do not feel safe having a conversation with him and I don't even think it will be possible to have a conversation with him anyways.