I WANT MY CONTRACTS CANCELED!! PATHETIC SERVICE

Every month i have to phone in to ask when will i recieve my statements. Second of all they put a R350 spending limit on my contract WITHOUT notifying me!!! When i CLEARLY told them my spnding limit should be R00.00!!! Whenever i phone the call centre it takes me about 30min to get through to speak to someone! When i requested for the Manager they hung up on me!! I put insurance on my device and NO ONE can tell me what my insurance covers FYI I pay about R300 p/m just to have insurance on my device thats excluding the other R1900 for my 2 contracts i have with them. When i asked if a supervisor can tell me what im covered for with the insurance they said he doesnt want to speak to me. This is absolutely the WORST service ive even seen!! I want to cancel my contracts the service is PATHETIC!!!