Complaint on quality of school shoes

I had sent Woolworths a mail on Tuesday and another one today to their customer Services email and it’s not going through. I had bought 3 pairs of school sports takkies mid-March, it is now April and all three pairs have torn. I am extremely disappointed in the quality they are selling us these days. Their buyers are selecting inferior qualities, yet they maintain the high prices, they have lost my loyalty; I have unequivocally purchased from them for more than 20 years. I have never experienced a rip-off. The shoes needed to be durable as I was under the impression, they were made with a child’s vigorous activity in mind. They will not be able to retain their competitive advantage and or differentiation this way; with the volumes of complaints, they have opening themselves to substitutes. I am not in any need of a generic response.