Poor customer service

I ordered two furniture units from decofurn in the beginning of April and one of them had a missing piece. I called customer care and was told to send an email since I had ordered online. Post sending the email, it has taken them over 3 weeks to let me know after following up twice that the piece is ready in store for collection when I had initially had my units delivered to me at a price. This was very bad customer service on their part and makes me feel undervalued.