Worst customer service experience ever

I ordered a device from FNB and it was meant to be delivered yesterday, the communication I got was that it would be delivered between 09:00 and 17:00. The courier arrived at 08:41 which was before the time communicated and I was busy at the time and I informed reception to tell him I was on the way and they said he was said he was going to leave and come back later. I then called the number that was on the communication, they told me they would get a hold of the driver, I then called again and they said he said he would be back before 16:00, I called them again at 15:45 and again at 16:15. I then waited at the office until 17:30 and I actually knock off at 15:00. I then get a message this morning which read "We were not able to deliver your fnb order :-( You could be liable for the delivery charges on your fnb account should you miss a delivery again. Please call us on *** to avoid cancellation", how ridiculous is this if i called them four times yesterday and they couldn't give me a straight answer? FNB needs to change their courier company, FNB is a big company and they can't afford to have such mediocrity associated with them because it gives them a bad name.