You need to get professional strata legal advice as soon as possible and you need to get your strata committee involved.
These all look like common property defects and they should be fixed under the statutory warranties. They may also be an indication of other serious defects in the building.
It also seems as though the builder, strata manager and developer are happy to lie to you to run down the clock on the defects.
Do not waste another second wondering about this. Call a strata lawyer today. There are a couple of excellent ones listed at the top of the page