UNRELIABLE service

What an unreliable service, my sister sent me an item last week with the R100 PAXI courier, I was promised to get it on the 17th, 16th theybsent a message saying "delivery os on track " TODAY IS THE 18th AND I haven't received my package yet, no explanation whatsoever. I enquired in their WhatsApp number and was told to be on the lookout for tomorrow.....flabbergasted by the service as I've never had a problem with it before