Ordered, paid ±3 weeks ago and no answers since

I ordered a wiper motor for a Citroen C2 and after paying heard nothing. I then queried this by WhatsApp on their WA about delivery. I received a response that this was being prepared for courier. This was about 3 days after I had paid. Its now more than 3 weeks later and I have had no correspondence about when I can expect delivery. This is very poor and completely unacceptable.