I just made a phone call to find someone to unblock the drain. The worker asked about the situation and said it couldn't be cleared.

I asked, "What should I do then?" The worker said, "How much are you willing to pay?"
I said, "You can't clear it anyway, so what does money have to do with it?"
Then I contacted another company.
This worker didn't ask much and directly scheduled a time to come and check.
At 1 PM in the afternoon, I reminded him to bring a flexible drill bit.
My budget is between 300 and 500.
If it exceeds this amount, I'll add one more dollar, but no more!
(Update: Unbelievable, the second call was from the same group as the first!!! I only found out after answering the third call.)