[rahimnathwani]

"It's my understanding that the number of shares are a worthless number without knowing how many shares have been issued in total. Is this correct?"

It's more than correct :(

Even if you knew the # of shares that had been issued, you'd also need to know the rights attached to each class of shares (e.g. some classes may have specified liquidation preferences) and also the terms on all outstanding options/warrants.

It sounds like you've already decided to take the offer (even without calculating the value of your 0.75%). So your only problem now is to verify that the # of shares in your contract matches the % in your offer. MalcolmDiggs' suggestion (getting the company to include the % that this represents on a particular date, in the contract) should be enough. That way, there's no chance of misunderstanding, and there's recourse for you if it turns out they lied.