Kotak Securities — data integrity and extremely poor customer support

Website:

www.kotaksecurities.com

There were consistent mismatch between the statement provided by kotak securities and the online view in three mutual funds in my account. The numbers o[censored]nits kept changing.
When it was brought to their notice, they sent the mutual fund statement for one of the funds and thereafter the numbers matched, even though the final numbers o[censored]nits reflecting in my account were lower than what was reflecting earlier.
For the other two funds, the numbers o[censored]nits progressively declined till it became zero.
I have been following up with them for the last 3-4 months asking for an explanation for the discrepancy. Initially they kept fending it off with automated emails followed by emails asking for some or the other detail. I was asked to provide screenshots, following which I sent them a screenshot of my online account along with a copy of the statement sent by them, which clearly shows the discrepancy.
However, the response was that they have not received the attachment, despite sending the attachments to them multiple times. On 4 May I was requested to send screenshots in the body of the email because for some reason they are unable to see the attachments. I spent considerable time pasting screenshots into the body of the email, including a screenshot showing the two attachments in my earlier email, only to get a response stating the screenshots are not clear and asking me once again, about the discrepancy that I am raising.
It's frustrating to say the least, that there appears to by just one recipient to whom I write who somehow does not get attachments along with the email, and on top of that, they will not bother to scroll down to see what have I been highlighting to them for the past 3-4 months, but have the gall to ask what the issue is...
Worst experience ever. I would strongly advice against using kotak securities as your broker. They have the worst customer care ever and the more concerning bit is that I am not sure if I can trust their system to maintain accurate data.
I would like an explanation on the data discrepancy; assurance around data integrity; speedy resolution and an apology for the tardy customer service.