I think the moral here applies to more than just dealing with big companies, but anything in general. Persistence can pay off big time.
Quick example: I interviewed with a company back in August and was told I'd hear from them in a week. I didn't so I began emailing the CEO (who I'd interviewed with) at least once a week for almost three months (never got a yes/no, so I kept "checking in"). Because I kept myself on the radar and kept pursuing it, when something finally opened up, I got the job and was told that they admired my persistence. Don't be afraid of annoying people -- if the answer isn't final yet, keep trying.
Quick example: I interviewed with a company back in August and was told I'd hear from them in a week. I didn't so I began emailing the CEO (who I'd interviewed with) at least once a week for almost three months (never got a yes/no, so I kept "checking in"). Because I kept myself on the radar and kept pursuing it, when something finally opened up, I got the job and was told that they admired my persistence. Don't be afraid of annoying people -- if the answer isn't final yet, keep trying.