Bad Quality and customer service

I am writing this letter with great anger and agony . I bought a pair of Madison shoes and I struggled to put my foot inside the left shoe and checked the size written on it was 5. I put the shoe on as I thought it’s new that’s why it was tight. I wore it from 10:00 am till 13:00pm and my foot was throbbing, aching and swelled up . It cannot believe that your company does not have quality checks as the shoe is obviously marked incorrectly and should be a size 4 marked as a size 5. I own a 2 more pairs of Madison shoes as a loyal customer this is a great disappointment. I would like to advise you to invest into quality control if you would like to charge the prices you charge for your shoes.I also have a red pair of Madison shoes from you that comes out when I walk as it’s too loose I thought it was an isolated incident. The fact that cheaper companies can get this right means that your standards are either not there or very very low .I am upset to say the least and even considering legal action for the pain I endured whilst wearing that shoe because I was in church I did not have a spare pair and could not also take them off or leave. I need you to get back to me about how you will solve this issues ASAP. I have sent an email to customer service and called no one responds both ways.