Complaint/ Bad customer service received

Yesterday I was very disappointed with the service I received from Stanger/ Kwadukuza Shoprite. When entering the store I was asked to take a trolley and tire my groceries as they now no longer have a parcel counter...I had to push this heavy trolley amongst a lot of trolleys in the store which was very hard to move around. I then stood in a long queue for close to 30 minutes when I got to the cashier I was told I am standing in a wrong queue for only 10 items cashier named Hloni Ngubane that was helping me then showed me a sign above my head...I apologize as I really did not notice that sign as I thought it the first line that was for 10 items not the second till...she had to void some of the items as I was now forced to select the only ten items and I was told to join another line from the back again to be able to pay for the rest of the items and I was like no I rather leave it. She and her manager said even the big trolley you are pushing is not allowed in this line I must put it on the walk way and mind you this was not nicely asked it was an instruction. After paying as I was trying to check my till slip she they voided other items the rude cashier Hloni Ngubane said help me pack your items...like really who needs help with packing 10 items and she could clearly see I was double checking the slip. I was left really disappointed by the bad service I received. Which makes me wonder if the elderly people who do not have platforms to voice their voices are forced to this treatment. The lack of customer service is really bad at this store. As a store manager and supervisors since you have a lot of staff that is just wondering around the entire time why don't you allocate just one or two people to check the queues and show them the correct queues...it is no child's play to wait in the queue for too long and get told to go join another queue when you have already reached the till point.