I don’t seem to understand this line. Perhaps you an explain a little more?
My interpretation of the statement is that the principal sum you secured is N500m and your monthly repayments come up to N5m/month which I deduce from further below where you said you suggested to increase the repayment to N30m.
If my deduction is correct, then you won’t be able to extinguish that loan in five years (60 months x N5m/month). There seems to be a broken link somewhere. Don’t you think?