You have to return the money back today. And I think it is not polite at all, but a little rude and strong. I don't say things like that, even if in this situation, anyway. You don't want people to see your impatience and little anger, right?

呵呵， 着这个场景中， 它的意思是： 无论如何，不管怎么样；表示不管条件怎样变化，其结果始终不变；言外之意是你不要在找借口了 ‘怎么着’ means 'anyway' or 'anyhow' and i do not care what the excuse is , today you must give me the money

it means at any rate,anyhow or in any case，it's a colloquial words.意思就是无论如何，无论怎样，是比较口语化的词汇。

It meas 无论如何，u can think it means "must"

怎么着 还有其他意思的，比如下面这个情景： A：你今天别想离开这。 B：怎么着，想打架？ 这里的“怎么着”的意思就是 what do you want ，你想干什么。 再加上 无论如何 anyway，anyhow，怎么着 就没有其他含义了。需要注意的是，“怎么着”中的“着”的发音是“zhāo”。这句话有点北京方言的意思。希望能够帮助到你。