Tight Tonic Leggings Have Different Sizes Despite Same S/M Order

I ordered two pairs of shorts and two pairs of leggings from Tight Tonic on September 12, and the products were delivered on September 18. I specifically requested size S/M for both pairs of leggings, but one of the leggings I received is labeled S/M while the other is labeled M, and there is a significant difference in size between the two. The fit is also extremely large, and there is absolutely no firming or compression as advertised. The products do not meet the stated size or performance expectations.

I contacted Tight Tonic through WhatsApp, explained the situation, and asked for assistance with the return and exchange process. I was told that someone would contact me, but despite sending multiple messages since yesterday evening, I have received no response at all. Interestingly, when I contacted the same WhatsApp number from a different phone number to ask about purchasing new products, I received an immediate response, while my messages regarding the existing problem have been ignored.

I want both the disappointment I experienced with the sizing and fit of the products and the lack of customer service to be addressed. I request that this situation be resolved and that I receive a full refund for the two pairs of shorts and two pairs of leggings I purchased.