Credit and resigning

I was curious about a couple things I was hoping yall could help me with.
1)If you recieve credit for doing an offer, can you lose it, for example if you signed up for_______and you then canceled it after recieving credit you wouldnt lose your credit right?

2) this is the one I'm really not sure about. Can you recieve credit for an offer more then once? For example say I signed up for efax on freeipods got credit and then canceled it could I sign up for it again on freephotoipods and recieve credit and have it be good?

thanks for reading this and taking the time to answer

[Typical Response]You should give the offer a try throughout the free trial,a nd continue the service if you like it[/TypicalResponse]

It would be very rare for a credit to be taken back after it's been given.....no matter when you cancel.

Thanks for replying that helps D does anyone have an answer for my second question?

As long as you don't enter the same info twice per offer provider, it's okay. (Not that I have done this or condone it)