Buyer cancelling purchase for wrong postage, but sale was collection only?

[michaelcarp]

So I sold a buy it now item, collection only.

He asked if I could post, I said he could arrange his own courier.

He has now asked to cancel citing wrong postage!?

Will this affect my rating?

I have done nothing wrong, was their mistake.

Thanks 

[61stephenuk]

Cancel selecting at buyers request,this will not affect you at all

[michaelcarp]

Hi, is not giving me this option, only approve buyers request?

Thanks 

[61stephenuk]

Use that then if it says approve buyers request to cancel