My bike was vandalized and the top tube is completely bust, is it possible to get this repaired/replaced?
any advice here would be great, thanks a lot.
First of all - that sucks - sorry that happened. Your frame cannot be repaired.
You are in a real rough spot as the components are nice enough to reuse, but finding a frame in that style is going to be hard. Bicycle models that allow you to buy only the frame are high end models, and there aren't any high end city bikes. You don't want a mountain bike frame as they are designed for suspension length forks. Hopefully you can find a city (flat bar road) frame, but in absence of that, a road frame should work. If you can find a frame for less than $200 then give it a try. If you cannot swap out components yourself and have to pay a bike shop then it may be totaled.
Take it to a Giant dealer and ask them how much it costs to replace the frame. This price may be close to the cost of the bike.