Lost parcel blamed on me

I placed an online order 8th Feb. On the 12th Feb, and again on 14th Feb, I was called by Ram couriers to ask what was in the delivery - They indicated they were missing a box, and wanted to know what was in the box. On the 19th Feb, two of the three boxes were delivered. I logged a complaint with Clicks then. Since then, there has only been questioning about whether or not I actually got my delivery or not.

It's absolutely not on. The courier lost part of the delivery, and I am being blamed! I want my money back or delivery of the missing order.