Poor Customer Experience

I experienced very poor customer experience from UPS recently. I waited for a parcel to be delivered for over 2 weeks. I had to call the contact centre on 2 occasions and I was sent from pillar to post. the one consultant confirmed that the product would be delivered on the said day however I still have not received my parcel. I was even informed that they have a backlog of deliveries and I dont think that should be valid reason.