Giant Cyclocross Seat Camp (Allen Key) Bolts Rounded off

Hey - so I got the above bike second hand, looks new all apart from the above!
I've managed to take the bolts out (needed to adjust the saddled height) but no idea where to get replacements. I did notice that the drinks bottle holder had seemingly similar dimensions (both took a 4mm Allen key, 2cm in length) but on closer inspection the drinks bottle bolt was a little thicker and a little longer. Secondary problem may well be that I've ruined the thread/frame? Later being a little unlikely even by my pessimistic standards
Any suggestions?! Back on my old bike in the meantime
I've managed to take the bolts out (needed to adjust the saddled height) but no idea where to get replacements. I did notice that the drinks bottle holder had seemingly similar dimensions (both took a 4mm Allen key, 2cm in length) but on closer inspection the drinks bottle bolt was a little thicker and a little longer. Secondary problem may well be that I've ruined the thread/frame? Later being a little unlikely even by my pessimistic standards
Any suggestions?! Back on my old bike in the meantime

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The clamp is removable
Like I say I shoved a bottle cage bolt in; think that's caused a secondary issue?
I did have a look and couldn't see any damage..
Ugh... won't be doing that again!
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build
This is the style of seatpost clamp that I have (http://road.cc/sites/default/files/styl ... k=Y9C0pHsv).
You can just about see that part of the bike is removeable and is affixed by two bolts. The problem I had was the bolts became rounded to allen keys.
I went to the local hardware store and got two similar bolts (although flathead screw not allen key). The problem I had on my first outing since (12 miles) is some slippage of the seat post and the bolt appears to have come out a little.
I will hopefully go to the Bike shop today & if not resolved I will go to the manufacturer shop this weekend.
Any guidance/suggestions on solutions always appreciated.
You need the right size bolts, flat head will not give the right torque, you also should be using some gripper paste.
Get it right or you risk scrapping the frame!
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build
I went to the cycle shop and it was really helpful! Replacement bolts, sizing me up for the seat & a general look over at the bike cost all of £3 (Scott Cycles, Rubery, Birmingham). Only a 2-mile cycle back to work during my lunch but seems much more stable.
A number of suggestions were also made - including inserting an extension to lift the handle bar, which is presently a few inches below my seat, may be kinder on my back!
Other than that, he told me it was a great purchase/bike.
Bars a few inches below the saddle is normal on that type of bike but may not suite you, its easy to flip the stem (so it points up not down) that will lift the bars about an inch for free, also look at any spacers you can move from above to below the stem.
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build