Unsatisfied with vodacom

WE Took A Vodacom data contracts everything was running smoothly till this year from January and started to call them of the latency of the line. up to now they have not rectified the issue at hand the call center only solution is to reset the port and it runs well for an hour then starts to do the same problem, they then informed me that a technician will call which never happens or an sms when i give them a call i have to make another report and have to wait between 7 to 14 working days. This is a bench of contract from there side because i not getting the service we signed for. I rather be released from this contract because they just don't care