Hydraulics stores stole my money and did not deliver

I ordered two items online and only one was delivered. I then got an email from a person called Tamrun Beath apologizing for the mistake and he promised to ship the missing items. I wait and for weeks and eventually I write to him/her again. The response was another apology and this time she/he says the item is out of stock and it was an error from their side to promise me to ship the item. This time he/she says I must either pick an option for a refund or a coupon to buy again online. I chose the coupon. I waited and waited and I'm still waiting. The level of service is beyond poor. Imagine a big store like this one with zero customer service