Wouldn't call it "wage theft" so much as "wage slavery." Theft implies a higher wage was promised to you when profits increase when that absolutely wasn't the case. They told you completely shamelessly that you would be getting the same shitty wages no matter how well you do and you had no choice to accept it, you know, basically like a slave. At most a slave that could choose their slaver.

Actually, calling wage work slavery isn't that far off, since many slaves throughout history were paid in some form for their work, and some could even (in theory) buy their freedom. You will never be able to buy your freedom though, the capitalists calculate your wage to ensure you remain poor and desperate so you keep working for them.