Unhappy with their online service

Went on to the edgars website, bought two R200 sweaters for R350 because they were on sale. They only delivered one. I wrote them an e-mail to raise this. The customer service consultant calls me to tell me it was my fault that I didn’t click on the second one and there is nothing she can do. So clearly I gave away my R150 to Edgars cause there’s nothing they can do. She tells me I was suppose to choose two sweaters but on their website it’s written “Take two” on in one block. The price tag on the sweater was R200 when I received it. If this is not fixed I’m taking this to the consumer goods and service ombudsman.