Is Yun Xin, a short message platform provider?

It's rubbish. I opened a 5000-piece product in 200 yuan, and 66 1 piece was issued during the Mid-Autumn Festival, and the delivery rate was less than 30%. Later, I contacted them and asked them to solve it. The service attitude was very poor. I was also told to call 66 1 to pay a return visit. I'm really crazy. I can make so many calls, why do I need your group sending platform? Later, I changed it to 65433. He also said that Unicom had a holiday, and he was a fucking beast. Liar. . . . Please don't believe it. . .