BULK Delete CRM Product BUG

Hi All, 

I have found this wierdest bug in the CRM product not sure how MS has created this feature trying to delete the multiple Custom activities from activities in Advanced find.

1- There is no option for Activities entity in Bulk delete option

2- When i delete it from ADvanced find by selecting all (250) records it never deletes the activity pointer base,if i select around 200 and then delete then the record count falls down after deletion, seems there is some bug in the limit

Please help in this regards i m using crm 2013 very weird sitatution at client.

Thanks,

Waqas Latif

CRM Developer

Waqas Latif CRM Technical Consultant