SmartBuyGlasses interview questions

I applied for a Graphic Designer position and received an email asking me to complete a practical exercise before moving forward with an interview. The task was to create a website banner and a newsletter, which I delivered in less than a day. Unfortunately, I never received any response after submitting the work, no acknowledgment, no feedback, not even a simple thank you. I found it unprofessional and discourteous not to send at least a short message to close the process and appreciate the time I invested.