Bad product and service

I purchased a plasma stand. As I was arranging it they I noticed it was missing holes. I called them and they told me it's not their fault and I should bring it in store I asked them with what money for delivery and staff. I have bought for more than R20000 previously and never had an issue of assembling their products. Wrote on their Facebook page. They promised to call back and they never did after dealing with rude sales agents over the phone. Been almost two months they have not called would like to know what steps to take from here.