kez:When I got the scooter back the auto start button seemed to be
struggling to start the scooter and yesterday just wouldn't work at all
....It also has a bad squeek coming from somewhere
....rain water had collected here and there's no drainage
....scooter won't start and stalls whens it's cold
Basically, you get what you pay for....
From the sounds of it Kez, your scoot really needs a bit of love more than anything else. Sure, I'm not a fan of most Chinese products, and I agree that you get what you pay for, but fundamentally, with a little love, your scoot will be fine.
You mentioned it lives on the street, and there was water in the battery box- I always encourage my customers to keep their scoots undercover where possible. Sure, you can use your scoot in the rain, but it helps to store it out of the rain when you're not using it. In the rain, you'll get rusty nuts and bolts (more so on a Chinese scoot), and condensation in the electrics. Think of a lawn mower- you can cut wet grass, or even use it on a rainy day, but you couldn't expect faultless reliability from your mower if you left it out in the weather all the time. I know with inner city living it's not easy to find a dry spot, but constant weathering will (unfortunately) take it's toll...
I reckon the squeak is from one of the brakes, especially if it is in the weather. Next time you walk past a car yard, have a quick look at the disc brakes on one of the cars that hasn't been moved in a couple days- it'll look rusty as. I reckon your brake/s have a bit of rusty-weathering on them, causing the squeak. A good bit of use will soon get rid of that.
Auto start button- just sounds like a flat battery, which happens frequently this time of year. No biggy, a new battery will sort that out quick sticks.
I reckon it needs a service by a good scoot mechanic, a little bit of love, a fresh battery, an undercover parking spot and the idle screw needs to be adjusted up a little; then it'll be right-as-rain, and I'm confident it will be hassle free. And it will get better with age. Get some k's on it, and the engine will free up, and it will be a different machine...
But ultimately, if you're not happy, move it on. Cut your losses, and get something else. If you don't want the bother of selling, just trade it on something from a real scooter shop, there's plenty of good operators in Sydney...
Hope this helps 
Tassie's number one scooter dealer.
www.scootershoplaunceston.com.au info@scootershoplaunceston.com.au