My business email address has been blocked for telkomsa.net

<p>I run a business which sends invoices and license numbers to all my customers monthly and all of my customers with telkomsa.net email addresses are not receiving my emails. When I queried this with my service provider, they tell me that my emails are being blocked by the customers server. I have put in a service request to ********** on the 31st of October eventually using an alternative private email address once I realised that they were not receiving emails from my business address. Their support hotline told me that they do not accept a report via telephone - it has to be an email - which is a bit ludicrous if your email is being blocked. Basically I am being ignored - when I enquire I am told that "Teir 3 is working on it" . I am losing customers because of this.</p>