Email server issue

My gripe is mainly with Telkom technical, but Both Telkom and Vox Telecoms. in that since i have moved my ISP service over to Vox i have had a problem with my Outgoing server on my Telkom emails. Vox router settings are different to my previous ISP. Since inception i have been pushed back and forth ,for many ,many fruitless hours on the cellphone, with technicians from both Telkom and Vox. each one of them cannot solve the problem, and blaming each other. I have request a Site Visit by Telkom-Reference no.***2 already 4 days ago and being escalated. But NO RESPONSE at all. i even employed my own independent Technician , who cannot solve the problem. i am at my wits end with both Telkom and Vox for their lack of urgency to try and come to site (as it can only be resolve on site )to try and solve my issue. They cannot even do a Teamviewer meeting. How utterly disgraceful is the NON-satisfactory service. Telkom communication utterly stinks.