Discovery Health benefits were stopped

I have been to Overseas on 1st of June 2017, on an emergency visit,

My mother was in a cancer hospital, and in that type of situations no one will remember to inform Discovery Health, I was away for 2 months from South Africa, July 2017 my debit order didn’t go through due to insufficient funds

And I got e-mail from Discovery Health to say "YOUR Discovery Health benefits were stopped" on 5th of August 2017,

If my "Discovery Health benefits were stopped"

For the month of August 2017, is this fair enough to ask me for August month Premium?

I spoke to Discovery Health executive now, they said I have to make the payment for July 2017, August 2017, and September 2017 which is 4488.00 , i am very confused , if the Discovery Health benefits were stopped for August 2017 , meaning i received no benefits for the month of August 2017 , in simple English that is what it means right ? if i have to bring my account up to date, i will have to pay for the month of July 2017, and September partially because till today's date i have no benefits, i would like to request the management to look at this issue, the system should be design to help your customers, and not to make them sad for being with Discovery, it is really unfair for any customer. Because when we take the membership this kind of things they didn’t explain me, if I was involved in an accident or may be return to South Africa after 1 year, I have to pay the whole year premiums? Is this really fair enough?