Horrible telecommunications sale service

Horrible service. Empisal machine broke and this is the only place to get parts. Called, got a quote and they told me that the part will be couriered withing 24-48 hours after proof of payment has been send through. After receiving no confirmation that they have received proof of payment, I called them and they said that they haven't received it and that I should forward it again. Since the 29th Jan when part has been paid till today 4th Feb I still haven't received any feedback on when I will receive my part, even though I have been calling them everyday to find out whats going on. I had to cc in the manager/owner (not sure how high up he is in the business) to ask what's going on since I am fed up waiting for something that is costing me business and customers due to lack of service.