If you live in a moobaan then 500 per month sounds right, but besides garbage collection it usually includes fogging for mosquitos, gardening services in the common areas, security and so forth. It could be a little less and it could be as much as 1,000 or more if there is a pool, etc.
But if you live outside of a moobaan then 500 is very high. It should cost around 40 to 150 top for rubbish collection alone.