Bad service

I sent an item to a customer via Aramex and as they say it's overnight i usually give it at least 3 working days delivery just understanding the difficulties they might encounter, but now it's 2 weeks without delivery and they keep saying they will call me to tell me what's going on but i end up being the one calling and they take me from pillar to pillar. First day on the 2nd of Sep i called and the guy by the name Andrew said to me that Lindi is the person who was supposed to call me but she didn't and the lady at switchboard by the name Lerato as well assured me that she sent Lindi an email and logged in my complaint but still no one called and on the 4th again i called and got the same story and this makes me angry as i did pay it's not like they're doing me a favor and all they could do is call and explain to me what's happening as they did the same with the receiver of the goods they kept telling her tomorrow you will receive your stuff since last week.