hello i have been using my phone now in its case for about a month taking it in and out the case more then 50 times a day. and around the rims of the edges the silver colour has started to come off also the bottom of the phone where it reads tmobile there and the silver part below it is getting black spots in the silver and now has started to turn black. how shall i speed up this process. i brought the phone of ebay brand new, but the case had been used with a different phone, could there be something in the case that made the colour on the phone corrode?

You are talking about plastic, right? No corrosion. No color change. Friction--the silver coating is being worn off and your are seing the base material below.
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