Getting Multiple Attachments For Same Edited Attachment.

Problem1 :

We are having some trouble with the Servicem8 API endpoint result we received in Attachment. We are getting multiple entries for the attachment for the Job UUID : d6023442-9e7e-4438-aae6-1ee1d115e4bb
Job #23422

This attachment has been updated 2-3 times but ultimately we should receive only one attachment in result json at the moment. But currently its giving each edited Attachments. Can you please look into this?

END POINT : https://api.servicem8.com/api_1.0/attachment.json?%24filter=related_object_uuid%20eq%20%27d6023442-9e7e-4438-aae6-1ee1d115e4bb

Problem2 :

Some time we are getting this error
(
[errorCode] => 429
[message] => Number of allowed API requests per minute exceeded
)

Query :
Can you please tell us how many API request we can have per minute? And if we want to increase it then how can we do that? Please answer on this as well.