Up size for men's clothes

Hi, I have a Truworths Acc, but I have one problem I have sent a email to them no response. Why don't you cater for bigger sizes for men, than just up to 2xl? We need 3xl & 4xl shirts/t-shirts & 44/46/48 size pants. That will be a good advantage in business sales cause we always have to shop by Edgar's & Woolworths to get bigger sizes. Please get these sizes to make us happy & remain loyal shopper's with you.