Mikali in your second last post what you describe does sound like a flat battery.

In a previous post you state the same and then mention you and your dad went to clutch start the car and for some reason your dad turned the key one last time and the car did start.

This tells me the battery was not flat at all. A loose battery terminal , cable or earth connection will give the same symptom.

In the end you have gone through and inspected and redone these connections.
I suspect this was the cause.

A battery doesnt go from not being able to start a car then a few seconds later it is charged enough to start the car. The only way this is posible is if inside the battery there is a break between 2 of the cells and and they dont always make contact.

If you still suspect the battery I recommend you full charge the battery overnight and then have the auto electrician load test it. This will show if the battery is past its use by date.