The Lidl app is not working to get 20% of overall shopping off. Just spent over £70 on weekly grocery shop at Lidl Warrington. Tried to use my Lidl app to get £5 off The cashier said the server is off And you can't get your discount off. So I have contacted the official Lidl customer service number in one of their leaflets, I spent over 40 minutes listening to spam about how good Lidl is on price and customer service. (Well if they would of picked up the phone and spoke to me it would of)! Yet Lidl have huge poster on the side of the shop saying save 20%. Enforcing Use the Lidl app. The Lidl app is off. So your spending more money to get money off. And the Lidl app doesn't work. It's quite a con, it really is.