Yes, Lots of people have had a problem and then gotten it fixed.
They usually start by carefully describing their motor, controller, and battery, after realizing the brand name on the bike is nearly worthless.
They give actual names to "broken components"
Next, they describe their symptoms in great detail, describing their motor noises as related to applying power or rotating by hand, for instance. The do not use terms like "any reaction at all" and instead describe specifically amounts of wheel rotation and duration using standard units of measurement.
They also understand that attempting to get replacement parts, from the bike maker, for a five year old product is Truly frigging hilarious.
Replacing the controller with a suitable replacement should be fairly easy and not too expensive. Isolating the problem with the motor might be more of an issue. Might require disassembly, could be toast.
Battery on a five-year old bike is going to need replacement, soon if still functional, and it might not be.
Hope you got a good deal on it