A question about つ (Slang): When to use っつ and つう

When do you have to use つ, っつ, and つう?

What’s the difference?

dont think there is a difference mate. っつ, and つう are just slang if I remember correctly

But there’s a grammar item in bunpro for it, and sometimes it tells me it is wrong to use one or another, and I can’t understand why.

Should I report them as errors?

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