Horrific service

Normally I do not complain, but the service at OneCart is horrific. They did not deliver my order, but said they did. So they might have given it to someone else. After multiple emails and calls, they refunded me. Second time, they delivered the wrong order to me...i phoned them twice to say they must collect the incorrect goods and deliver my order. Twice they said they will and that they will also phone me back. Nothing. This happened 5 days ago..since then i have sent emails and phoned and lady said they will refund me. Still nothing. I refuse to write this off..so all I can do is revert to complaining on social media (which I hate doing, but left no choice).