My trackpad is not clicking sometimes

I have noticed in the last two months, my laptop seems to not click with my trackpad. It would make click sound but not actually click.

However, i had a bluetooth mouse and it was still not clicking. If i restarted my computer, it would work though, funny enough i left it like that since my wife has a macbook laptop too. Just last week, i turned it on and it was working properly but i already had an appointment booked at the genius bar.

After going to the appointment, as expected he said that i would need to replace whole top case as with a new battery as it comes together.

This is what i got from quote;

Issue: Customer reports trackpad and keyboard intermittently respond

Steps to Reproduce: Verified in store. Opened the device and found corrosion on left side of trackpad flex cable

Cosmetic Condition: Dent to clamshell top right corner

Heavy chips to clamshell top left corner

Light scratches to bottom case 

Proposed Resolution: Replace the top case at out of warranty cost due to physical damage such as liquid damage.

If further damage is found further cost will apply.

Mac OS Version: 10.14.x

Hard Drive Size: 512

Memory Size: 8

Repair Estimate (AUSTRALIAN DOLLAR)

Item NumberDescriptionPriceAmount DueCustomer KBB661-02361Top Case w/Battery, US$ 0.00$ 0.00S1490LL/AHardware Repair Labor$ 109.00$ 109.00S6790LL/AFLAT RATE, RETAIL, TOP CASE MBP 13$ 462.73$ 462.73Total (Tax not included)$ 571.73$ 628.90

Now i am thinking to do it myself, or doing it with apple it self, or go to a macbook repairer shop for a quote.

Thank you everyone.