Instruct: Classify a given review as either positive or negative.
Query: Can't trace lost shipment.

I have never seen the Melnor 3060 timer. The accessory for it, a moisture sensor, arrived two weeks ago, but the Melnor timer it connects to has not arrived. Three times I have been unsuccessful in using the tracking number to find out anything other than "shipped". The message "invalid tracking number" always displays. Supposedly my timer was shipped June 22. Today is July 23. Meanwhile, I have had to pay for it on my credit card.