I’m not trying to be difficult here, but I’m struggling to understand what you mean by some of the terms you’re using. Could you clarify a few points?
When you describe the manager as hostile / abrasive / aggressive, what specific words or actions are you referring to?
You say there was a “slight query” with the return what exactly was the query, and why do you consider it slight rather than a normal policy issue?
As you did receive a refund, is your complaint mainly about how the interaction was handled rather than the outcome itself?
You mention leaving the shop shaking do you see your emotional reaction as evidence of wrongdoing, or separate from the manager’s actual behaviour?
You suggest the manager may have been running on adrenaline or taking a “no-nonsense” approach what makes you think that, rather than them simply enforcing store policy?
You refer several times to the assistant as a “young girl” why is her age relevant to the situation?
When you say you were blindsided, what exactly was unexpected the policy, the tone, or the fact that the return was questioned at all?
Finally, what do you think the manager should have done differently while still following store policy?