Vodacom ***** Disputes Email sending back Mail failure

It Pathetic to say the least, that my husband has to suffer for what vodacom has done now that i have sent numers amounts of emails to the ***** Disputes department, not only am I not receiving my so called automated reply for my referance, my emails are not being delivered to the department im receiving Mail Delivery Failure saying that my email was unable to be delivered

This is the mail delivery agent at Symantec Email Security.cloud.

I was unable to deliver your message to the following addresses:

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Reason: 552 #5.3.4 message size exceeds limit

The message subject was: ******* Sim swop - ***** Complaint The message date was: Wed, 16 Jun 2021 16:10:36 +0200 The message identifier was: 9A/23-52906-5B70AC06 The message reference was: server-17.tower-228.messagelabs.com!***!177869!5

Please do not reply to this email as it is sent from an unattended mailbox. Contact your email administrator if you need more information, or instructions for resolving this issue.

AND YES I AM USING THE EMAIL ADDRESS GIVEN TO ME BY YOUR VODACOM HELLO PETER DEPARMENT ***

this is a very serious mater and I am going to take this further with ICASA

Kind Regards Natalie Swanepoel ***