As you may have noticed, we have an ongoing bug regarding email notifications and due that we are facing difficulty in responding to your requests.

I have already brought this to your attention several times in past few months,but still haven't found a solution for this.Since you have mentioned that it might be a problem from ourside,please note the we receive emails from all other customers we deal through email communication and receive their email without any delay.

Please check if there is any grammer mistake in above paragraphes and hightlight the mistakes. And also add appropriate vocubulary to it.
I have underlined some problem areas. Please try to fix them and re-post:

As you may have noticed, we have an ongoing bug regarding email notifications and due that we are facing difficulty in responding to your requests.

I have already brought this to your attention several times in past few months,but still haven't found a solution for this.Since you have mentioned that it might be a problem from ourside,please note the we receive emails from all other customers we deal through email communication and receive their email without any delay.
As you may have noticed, we have an ongoing bug regarding email notifications and due to that we are facing difficulty in responding to your requests.

I have already brought this to your attention several times in the past few months,but still haven't found a solution for this.Since you have mentioned that it might be a problem from ourside. please note the we receive emails from all other customers we deal through email communication and receive their emails without any delay.

Check for any mistakes
Students: Are you brave enough to let our tutors analyse your pronunciation?
As you may have noticed, we have an ongoing bug regarding email notifications, and so we are facing difficulty in responding to your requests.

I have already brought this to your attention several times in the past few months, but we still haven't found a solution for this. Since you have mentioned that it might be a problem from our side, please note the we receive emails from all the other customers we deal with through email communication and receive their emails without any delay.
deal with through?

can with be followed by through ?
Yes: deal with (customers) through email.
Try out our live chat room.
Deal with through

or

Deal with customers through..

Which is correct?
I was merely illustrating that both were possible. In your text, do not include 'customers'.