What should I do when a seller insult me?

What should I do when a seller insult me?

First, I am NOT a seller but a buyer.
Second, I have been at this site since Dec 15 2018. I had placed quit a lot orders ever since. I just checked 29 pages on my payment page.
Third, I had less than 10 unsatisfied orders which I just canceled them. Not to order from these sellers after.
But, the past week, I had the worst experience ever since I joined this site.
I placed multiple orders with a seller during the holiday season 2019. He was quit good before. But he continuously deliver the orders late. Which I was not happy but understood. I reminded him because I wanted to send new orders with him.
Then I realized that several orders were only delivered 1 to 3 days then stopped. (I ordered traffic.)
I left message to him to remind him that.
He did not react to my message.
But I could see he checked in to this site. I guess he has a lot of orders to deal with. So I left few more.
I was really frustrated and left him negative reviews but they are all truthful.
This morning, I got two insulting direct messages and multiple insults to cancel orders.
Please look at the screen shots.

Image 1: Some of the orders I placed during holiday 2019
Image 2: The result of order.

Image 4: He left the same insulting message under every order he wanted to cancel. (I asked him to fix the problem but he chose to cancel. That is fine with me. But to insult a buyer had bought from him at least 30 times before. )
I report this to the help desk.

I had an accident with another seller before as the order stopped delivered before it was complete. I left a message but it became a review (I rarely left reviews). The seller contacted me to pointed out he would fix the problem and I should change the review. (Because I did not know I was writing on the review section, the default setting for the review was positive. So the review was positive actually but with a message was addressing a problem.) With his help, I correct the review. It was positive and with positive feedback.

So I am not here to ruin any seller's business. But I am not here to be ignored or insulted either.

Do you have experience like me? What did you do? Who is good seller that provide real web traffic?

Thank you!