Deloitte Offer


Need some suggestion, I was interviewed by deloitte and finally was called by recruiter and was verbally offered a package with negotiated package. He congratulated me and then asked for Visa documents for some internal Visa evaluation. Above happened about 2 weeks back but I have not heard from the recruiter after that. Sent few emails but NO response at all.
Should I really wait for them to return my call and tell final decision or just assume that verbal Offer does not hold good ?
Is it NOT professional at all to NOT call back after verbal offer ?