You mean for the format of the rejection email?

Software Engineer

That’s ok, you can just politely reject over mail saying you got a better offer. 
 People do this a lot.

Oh okay, thanks! see that you're from Deloitte, how's it going?

Software Developer

I accepted an offer from IBM but got a better offer from Deloitte later. I decided to go with Deloitte however is it wrong to reject an offer? Will I get into some blacklist to the company? I have ...

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I accepted an offer from IBM but got a better offer from Deloitte later. I decided to go with Deloitte however is it wrong to reject an offer? Will I get into some blacklist to the company? I have 1 month from my joining date at IBM. Please suggest

How to reject an offer?