Shocking service

I placed an order for 2 sports masks and received only 1 mask 2 weeks later. I was not advised or refunded for the additional mask that was not sent. I lodged a exchange and return complaint as there was no option for short delivery. Automatically, I received a response asking me to explain what happened. I didn't get a response for 2 days until I went to message on Twitter. On this forum, I was informed that because I lodged a request for a return my account will be credited. This is something that I never asked for. Just send me the second mask and all will be resolved. It has been 4 days since my delivery and no one is getting back to me as to when I will receive my mask.