what's the best way to stop people from using my debit card when I didn't even give it to them?

since June every couple of months someone gets into my debit card when I didn't even give it to them,then my card gets shut down and its annoying when you cant use it, I have one this time cause the last time they sent me one in the mail they sent two and I asked if I could activate the other one and use it if I needed to and they said I could so I have that one right now. the supermarket downstairs in my apt bldg will let me write checks when that happens so that helps,its very annoying cause I have stuff on autopay and then I have to call everyone and change the number again on my card, so how do people do this and how can I stop them? they took a lot of money out of my card this time so the bank stopped my card, its very annoying so how do I put a stop to this?