I would consider the "few months premium platform access" merely an enticement to try to get more money out of you the customer.
Try before you buy.
Not really a "compensation" style of action.
Sure, writing the wrong is the minimum expected outcome, however, did they at least make that trade free/refunded?
No offer of 5 free trades?
And on top of it all, you haven't named the broker.
If there's a systemic problem where customers are getting dudded, naming the problem broker is imperative to highlight the systemic issue, for the betterment of the broker and their clients.