Incorrect item delivered and non-existent online support

I had placed an online order on 15 May and received the parcel on the 19th, only to discover that one of the items is not what I had ordered - I ordered a Salomon Men's Outline FZ Hoodie but received a Salomon's t-shirt instead. How can you confuse the two, and does your system not flag an error like this? Anyway, I sent a mail to CUM on the 19th to notify them of the error and seek advise on the way forward to get the item I ordered. A week went by and no reply from CUM. On the 26th of May, I sent them another mail and its been 3 days and still nothing. I see other people on this site complained about the same problem and I also see that CUM couldn't be bothered to react on any of those complaints. What I can't understand is why the service in the stores are quite good but online it's terrible. We are living in a digital age where online shopping has taken over the market, how can a store such as CUM afford to treat their customers like this? And why do they still have an automated reply with an excuse that Covid-19 regulations have resulted in staff working remotely? I thought Covid regulations have been lifted more that a year ago? This explains a lot, I suppose... Whatever the outcome of this is, CUM have lost a loyal customer in me and believe me, I've spent a LOT of money in their stores over the past few years, but that's all over now. There is a lot of other brands who'd appreciate my business. Cheers CUM, hope you get your act together before it's too late.