Horrible delivery service from MTN's courier DSV

We have upgraded our company cellphone contracts with MTN and they use DSV for delivery of the devices. After MTN gave clear delivery instructions DSV failed to deliver the devices more than 11 times! I have never dealt with a more incapable company than them! We tried to escalate the issue but even the higher staff failed to make the delivery successful. Every time the driver either goes to the incorrect address or they want the director of our company to accept the delivery with his fingerprints. The director of our company does not sit around waiting for parcels, he travels around the country on business trips! After exhausting every possible avenue to try and resolve this, MTN failed. MTN could not even arrange an alternative delivery arrangements for us, when they saw that DSV is up to no good. This leaves us with no other choice but to put this horrible experience that our company suffered all over social media and to approach the consumer Ombudsman in this regard.