Security breach of details

I am a Telkom subscriber for many years and i always receive my statements via email and when i opened my contract my name always appeared correct on the statement ,so today i contacted the call center and spoke to Zanele so she needed me to verify my details so i asked her to give me the details and she couldn't i gave her what was needed, my statement reads MISS ASSED MOHANLALL,THATS NOT MY NAME and when i looked at the May statement it had my correct name and surname so thats means some stupid internal staff changed my details and that's like a security breach and Zanele has asked me to go to the store as to where i opened my contract(seems like the blame is passed on) when this is not my fault ,Telkom staff as who done this needs to sort it, Customer service is always so terrible. Lets hope this gets sorted as its a total security breach of some one editing details and i wont hesitate to take this further. I need management to get involved and discipline the person who changed my details and they must sort it.I would like to know who gave Telkom the right to change a name on the statement to ASSED??******** STAFF THAT WORKS THERE .