If you only had them for a week and a few days, you will have to be patient to gain their trust. Similarly, it is not good to suddenly take them out of the cage, as they can lose trust in you and may not want to interact with you at all. It is better to let them out for a few moments when they are more comfortable and has gained your trust. This can take years or months, so do not expect sudden development. Never force them to touch you, or grab them as they will lose trust in your hand, and become fearful of it. Always make sure you interact with them, as they can get lonely. Talking with them is a good activity.
If you want, you may search for tips and signs of your budgie gaining your trust. Some signs are found in their sleeping position, or how their daily interactions are with you.
I have also read your budgies' descriptions. I can see that Mithu wants to bond and play, as baby budgies are easier to form bonds and trust with. Older budgies are harder to tame, but best to remain patient and see what activities are good and fun for them.
Don't expect sudden development and bonding towards your budgies as you only had them for a month. Give it time, and you will be soon having lots of fun together! Also, interact with them everyday, and talk with them in small voices so that they can know you more and build trust.
Classical music are what budgies enjoy---avoid loud or rock music, as these are stressful. If you are out during the day, make sure that there is at least soft classical music playing. Budgies' instincts are if it's silent, it means there is something bad/predator. They are usually more scared as they are prey animals and are very vulnerable. So make sure to play soft music, so they'll feel safer.
Search for more tips and ask questions!