IPhone wi-fi Antenna broken?

Ok, so I have an iPhone 3gs, and it was having some battery problems.
So I went to this shop, and they replaced the battery.
But now it won't connect to any wi-fi, and when it does, it won't stay connected for very long and is so slow. Surely it can't be coincidence
So basically, is that even possible, that he nicked the Ariel or something when replacing the battery?
And do you think I'll have to pay to get him to fix it again?

Id like to give you and answer but i would need to know who "he" is because it was an Apple Rep, your options will be completely different than what they would be if it was just some random 3rd party repair… Lol, just go get a 5… The 3gs is not going to be able to run iOS 7

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