Return/Exchange mix up

I bought a pair of jeans from superbalist.com and unfortunately they did not fit me properly and I returned them to exchange sizes. Dropped them off at Potch pickup point and on Monday the 28th of March early in the morning and on Thursday the 31st of March I received and email from superbalist informing me that they received wrong pair of jeans. The attached pic of the jeans is some black old jeans I have never seen. So it appears that someone exchanged the jeans between the pickup point and the warehouse.

I rep**** to their email and unfortunately they do not reply to my emails and calling their customer care did not help because I only get an automated voice message telling me about their operating hours before they hang up.

Superbalist I need answers.