Frustrated by Telekom credit vetting

This process is frustrating. I went through it twice, I was told I qualify for the cell phone contract an a few hours later I got an sms stating that my contract cannot be processed due to credit vetting. I have 3 contracts with another service provider for my mother and brother. I was hoping to find a new home for us all three but it seems like this vetting process has frustrated me. Why can't they do the vetting before contacting you to say you qualify for the contract. It even goes as far as them arranging delivery terms. You'd think its a done deal. And it seems they cannot explain what the vetting entails