P500T in a little less than 2 years is very doable considering the income that you are receiving every month.
1.) If you can, increase your cash flow so you can pay that debt off faster
2.) If you can't increase your cash flow, you can still pay it in that span of time.
Assuming let's start this May until December 2012, that is 19 months. P70T X 19 months (assuming you'll be having that income monthly for the next 19 months) is equal to P1.33M. After all the taxes and other deductions, that is still a very big amount, way more than P500T. Even in less than 19 months, you can pay that off.
However, how much is your monthly expenses? Bills? Food? Other needs such as medications (if there is)? Make paying that debt off your priority from this day on. You can talk and come up with agreements with the creditor. Next is make a new budget and stick to it until you settle such debt.
I don't know about the monthly expenses but with that kind of income monthly and being frugal, paying that amount should be too doable. Just give it some time. 19 months is actually too long already. It doesn't take a financial guru to settle such debt, attitude towards money and finances is.
