NO SERVICE AND BREACH OF CONTRACT

My company has made use of Telkom since 2000. We have in the past never had problems with them. Since the beginning of 2015 we have experienced huge problem with internet connectivity. We currently pay for a 6 mg line but we are lucky if we ever get 000.06 megs. I have an many occasions taken this up with Telkom and my internet Service provider. The situation is getting worse.... I now want to end my relationship with Telkom and find something else that works...<br> I have now all morning been busy trying to phone Telkom to find out how to go about this.NOTHING!! no one answers the phone. I have spent all morning trying to contact Telkom. I now have had enough.<br> I will not pay any further bills until I have had some sort of response from them!! If they disconnect the service they must please inform me as I will not see the difference as to what it is currently <br> They are supposed to be in the communication industry????