FDM Group Software Engineering Practice interview questions

I'm not sure if my recruiter was just incompetent or if this is standard, but to preface I never answer calls from unknown numbers, and I feel like this is standard. If you leave a voicemail I will call back, or you can email me where I will respond. I had scheduled an interview with my recruiter via email for next week when suddenly today I got an email saying my application had been withdrawn. I never instructed them to do this. I then discovered that my recruiter had been repeatedly calling me for a few days with a different phone number than what was listed in his initial email. He didn't leave a voicemail, and I can only assume he took my lack of answer to an unknown phone number to be some sort of withdrawal of my application. Thankfully I already have another job offer from a different that I was likely going to accept regardless of the outcome of my FDM Group application, but this process left an extremely bad taste in my mouth.