2X EMAIL ACCOUNTS NOT WORKING FOR OVER A WEEK NOW

I stopped receiving emails on 2 of my accounts .When I contacted Telkom they said the online login code I've used for a couple of years now is not my login code they give me a new login code and password I've loaded it and can send emails but can not receive emails on it. I need to LOGIN ON DO MESSAGING into my old online login and password email (which doesn't exist as from Telkom) to see my incoming emails I can also see that their is some ******** going on on that accounts emails send and receive which is not send by me.I've also had a problem that my 20 gigs I've had for over 5 years now suddenly is not enough.<br> The only thing that happens is that I get a new ref number every time I email or phone.This mean that every time I complain I am back at the line.I did look at the ICASA website to lodge my complain there but you need to go thru a process a using the channels before you can lodge a complaint at them (SUPERVISORS/DEP HEADS ETCETERA) how do you get Telkom to respond to me and sort out my problem as this is costing me on my business and potential income,and it seems that somebody is using my email account which doesn't exist and 20 gig cap PLEASE ASSIST