ALDI Store Assistant interview questions

I applied online, which was a lengthy process in itself. I received an email being invited to a group interview which was fairly easy, the same day I received an email inviting me to a work assessment to show how I worked. You work 2hrs for free basically. You get to choose an allocated time to which when I arrived at the store I was told they had not been told I was coming and that I should come back another day, after explaining I couldn't do another day he me stay and made me work a pallet of stock to see how fast you could do it. I then got told by the manager that it went really well and I should wait to receive and email inviting me along to a one on one interview with the area manager. He told me I may have to wait a few weeks to be invited along to this. After over a month of waiting I got an email saying I hadn't got the job. I was rather upset seen as the manager of the store I did my work trail with said I did good and would be invited to the next stage. I sent them an email after asking for an explanation, I am still waiting for a reply to that email 2 weeks later. Overall everyone seemed nice and welcoming it seems like a good place to work I would not like to put anyone off due to my experience but I am not very happy at the way they handled the situation. I feel as though I have been fobbed off and It was just a massive waste of my time.