Unreliable sizing chart

I recently ordered two small-sized panties and one maternity bra from Momsy with the intention of supporting local products. Regrettably, my experience has been marred by a noticeable sizing discrepancy – the delivered items were considerably larger than the small size I had selected. Acknowledging the company's no-exchange policy for underwear, I reached out to customer service through multiple emails and even tried reaching out to them via instagram and messenger. Despite my awareness of this policy, I was hopeful for a more empathetic and understanding response. Unfortunately, the replies I received were brief, offering little more than a reiteration of the company's exchange policy. It's important to note that, upon receiving the panties, I did not attempt to try them on, given the visible size discrepancy. In my attempts to convey the severity of the sizing issue, I provided detailed emails with attached photos and side-by-side comparisons. Disappointingly, there was no acknowledgment or response to these efforts. While I appreciate the quality and comfort of the maternity bra purchased together, the unresolved sizing issue with the panties has left me dissatisfied. As someone committed to supporting local businesses, I expected a more considerate approach to customer concerns.My hope is that they can reconsider its response to cases like mine, even within the constraints of the no-exchange policy. A more responsive and customer-centric approach would undoubtedly enhance the overall customer experience.