Waterfall Security Solutions SQL Developer interview questions

I completed two rounds of interviews and was offered the position. During the onboarding process, I was informed that I needed to pay 5K and complete compliance training for the client. After completing these steps and initiating the background verification process, I attempted to contact someone for further updates via phone and email, but received no response. This left me feeling disheartened, especially as I had declined another job offer in anticipation of this opportunity, and I have not received any updates regarding the job since then.