Charles, if you paid rent via a money order or check, then you can confirm that the funds were delivered. This is easily accomplished by calling the bank or the issuer of the money order you used. Just make sure you have the check number or the money order number from the carbon copy.
Beyond that, if you are unable to make your rent payments you will need to make a change. This could be a longer term change (new job) as well as a shorter term change.
These organizations that provide rent aid in Gwinnett County could help. One (Lilburn Cooperative Ministry) is located close to you.
I would start with one of those organizations since they can even provide a referral if you do not qualify for their programs.