Poor survice and excessive holding time

I have been experience a very unstable connection for the last week or so. I work from home via VPN which requires a stable connection and it has been impossible for me to work. I have never called Web Africa for anything apart from activating my account and am horrified by the service received. I called the ADSL support and waited for minutes before someone answered the call. After speaking for minute, the consultant apparently couldn't hear me and dropped the call. I then called back and decided to select sales instead of support - within seconds the call was answered. I explained the situation and was then placed on hold again for quite some time before I dropped the call. ***!?!?! can someone pleas help me with my connection and explain why it is so unstable? I have 4 meg uncapped at the moment, would it help to move to capped rather? Any feedback would be appreciated