Costco, when I asked to reinstall my laptop, Costcothey forwarded my phone to the HP customer service depart.

Aboutnd on to the Walmart supermarket, it took me nearly one hour to chat with the staff through the online chatting system.

(The) Wait time to connect to customer service is unacceptable

This is the title so it doesn't need to be a complete sentence, but you were one word away from making it a complete sentence.

I have made a lot of calls to some big companies' customer service staff recently, but some of the wait times were absolutely unacceptable.

It's more natural to just say "call customer service"

Costco, wWhen I asked Costco to reinstall my laptop, Costco/they forwarded my phone to the HP customer service department.

Or "Costco forwarded my (phone) call" since it's the call that's forwarded, not the phone

After that, I spoke with an HP agent for about one and a half hours, t. The guy told me my address didn't belong to his area.

AboutFor Walmart supermarket, it took me nearly one hour to chat with the staff through the online chatting system.

Costco, when Iwhen I called Costco and asked to reinstall my laptop, Costco forwarded my phonecall to the HP customer service department.

After that, I spoke with an HP agent for about one and half hours, the guy told me my address didn't belong to his area.

When calling the BMO bank fraud hotline, I was asked to wait for 45 minutes, and I finally connected with the staff after one hour.

Aboutwhen calling Walmart supermarket, it took me nearly one hour to chat with the staff through the online chatting system.