Poor Outgoing Email Service

Telkom email service has been extremely erratic lately. In my case I have telkomsa.net mail on my 2 mobile devices and use Outlook on my laptop. The email works if it just a straight forward typed message. If any attachments are added to outgoing mail the device comes back with a message “Cannot Send Mail” Connection to the outgoing server smtp.telkomsa.net failed I reported this problem on Tuesday 20 Feb on 21 Feb they cleared the fault. When I called them for explanation they tell me they know of a problem with the server for some and they suggest I download Firefox to use Webmail. I am paying for a service to use smtp mail which keeps a record on my device for further reference but they are adamant I utilise Webmail with Firefox. You cannot speak to anyone in a higher position to discuss the problem the help desk techs just fob you off. This service sucks