Norbert's Service not up to standard

My wife (German lady) and I are regular patrons for the last 6 years, we have already completed several Loyalty cards and, always promote and take friend to experience this little jewel we discovered, some of them German speaking making it a treat for them, until 2 months ago the service was excellent, unfortunately the last 3 visits was not that pleasant and not the service I’m used to. 1 Ordered take away, and gave explicit instruction not to put spice on the chips, low and behold they did not comply to my request after I made sure they understood my order. I did not have time to wait another 10 minutes to fix the order. 2 Ordered Pork neck on a roll with side plate of Chips and Curry sauce, what I got was a small piece of pork neck maybe 20 or less chips and curry sauce, my meal was half of what my wife ordered and for a grown man it would be considered a starter, that was also after waiting long for the order, when I complained I was asked quietly by the waiter to let her fix it and I do not complain to Norbert because he will shout and scream at her, we could not wait for them to fix the order as it took over 30 minutes already for 1st order, they also attached an additional price tag for the pork neck and I was almost charged for two portions of pork neck instead of the small piece received. 3 Ordered 12 pieces of pork neck, when I got home only 11 pieces was packed leaving one of my guest short of their portion of meat putting me in a position where I had to offer my meat to them. I really hope they get their act together because it’s such a nice place to go to on a Saturday or Sunday for a nice German breakfast