I wouldn't be too hard on AG. Cursory evaluation of incoming stock is the norm for any business. Are they the correct size, color, fabric, how many boxes and stated contents against the invoice, etc. We can't expect AG to inspect every individual towel that comes from the manufacturer and for all we know, there could be mixed lots in the delivery with only a percentage of towels with the hot wire cutting process.
I'm not sure where the towels were manufactured but there is a long history of manufacturing in certain counties where the factory will substitute parts outside of contract or change the contracted manufacturing specs without asking permission or telling the buyer that it was done. It's one of the reasons that I preferred to manufacture in the US.
The most important thing to remember is AG's willingness to stand by their products and customers. If you are not happy with the towels, just give them a call.