POOR AND DISGUSTING SERVICE FROM VODACOM

Since my initial complaint on the 27th of March vodacom has not closed my issue. I have had poor network from the start of the year, after more than 10 phone calls, they advised me that a new network tower is planned and can take up to a year, i said sorry i will not wait cancel my contract. Its now 2 weeks since that call and they cant seem to be bothered. I paid last months bill in full, this months will be due. Why? i havent had service from vodacom? I I will never deal with them ever again, i want my contracts cancelled, i will not be liable for any penalties. Someone from vodacom better resolve this otherwise my matter will go public!