slowest service ever

i have been complaining to vodacom that there are signal problems where i live for a few months now, their technical division investigated and told me that the service issue is due to 1 tower servicing our area does not have the capacity to render service 100%. they then told me the best they can do is cancel my service and i just need to return the hand set. now my phone bill has gone from R400 up to R800 'n month with weird data charges. the cancellation department on *** never answer their phones or respond to emails. i have been waiting more than 3 weeks now. i can believe how sh*t this service has become, falsely advertising how brilliant and effective their service is. i am horrified by this issue.