Can a credit card increase my limit on spending? from $1000 to $2000?

I dont think this is right i didnt want it increased so is it right? Should i argue will it look bad on my credit if i do argue. THankyou for your responses.
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Yes they can and actually it looks better on your credit to have higher limits especially if you carry balances because this lowers your debt to credit ratio which makes up a full 30% of your score.

Never turn down a increase, and by the way in today's economy you are one of the few that are being given these increases which means your using your credit wisely so good for you keep it up,
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It might actually help your score a little bit by reducing the debt to limit ratio. Most financial people say that you should keep your debt to limit ratio below 30%

So, if your debt on the card was $500 and your limit is $1000, you are at the 50% ratio - not really a good ratio. Can trigger higher interest rates on your card.

Now increase your limit to $2000, keeping the same debt balance, your ratio is now 25%. That is a much better ratio that banks like to see.

If you don't want the higher limit, use self-discipline and don't go above your own self-imposed credit liimit. You'll be much, much better off.
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Automatic increases are common. If you do not want the increase, call the credit card company and request that they lower your limit and they will. However, if you are capable of self-control and not going overboard with the extra credit available, I would suggest keeping the higher limit because it can lead you to a higher FICO score by decreasing your debt-to-available credit ratio.
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No, if the company increased the limit that means you have good credit and the like you. Just make sure they treat you the same way when it comes to the interest rates.

I wouldn't call an complain because, you know how manage the monies and I would just use what I need and the rest leave it.
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Yes, that frequently happens. If you don't want the increased limit, request them to put it back. But it doesn't look bad on your credit record. It's your payment history that counts.