Can I return my iPhone 5 charger?

So, In October 2013 I brought an iPhone 5 charger and now it is broken. All my apple chargers break within just months due to them bending, it is weird because I barely bend them. Whenever I want the charger to work I have to bend it a certain way in order for my phone to charge. I don't know if this would count as misuse but I don't throw my charger around or purposely bend it, it just happens. Also can I use any guarantee, such as can I use the guarantee I got from another apple iPhone charger I brought or do I have to have the guarantee I brought with the product.

Unless there's any physical damage then, yes. But, only if you bought the charger separately from the phone. Only… If there's no physical damage.