Unsatisfied customer

I would like to write an official complaint because this is the 3rd time Im having a problem with Postnet.

My first experience was December... I sent a package to my sister in law in Petermaritzbirg. She was in hospital at the time when the package arrived and when she did receive it she said it looks like they open the package and she was not sure if anything was taken from the package. I couldn't remember all the goods I've sent her because it was different goods I sent her. The one specifically thing I did sent was a cookie jar filled with cookies and sweets. She said it looked like someone ate some of it because the jar was half full.

The second experience I sent a package to a customer. I do wood laser cutting for a living so some I always specify that packages are fragile and should be handled with care. When my customer recieved her package and collected it the lady that assisted her threw (handed without care) her package on the counter so my customer told her that it is fragile. With this incident all the goods sent was damaged inside.

My 3rd experience the same customer ordered more goods from me for her wedding and she recieved the package this morning. When she got home she realized that her order is in pieces. One lid of the candle holder was broken in two and one gift box hinge broke of like her previous order.

I want to lay an official complaint for this is unacceptable and make me look unprofessionalble in my business for supplying damaged goods.

We as customers pay for a service to deliver goods and specify whether it is fragile or any possible detail they need to know so that the packages sent can be handled with care and reach the reciever in perfect condition.