Nestar and Hybrid collections get lost!

Netstar thinks that they can just debit any amount they like from my bank account and also don't even provide you me invoices. I signed up for a new device after been a customer for years, I agreed up R140 pm with the sales consultant, 1st debit order goes off R215 I call to query, sir its pro rata I get told I accept that, 2nd debit order goes off R250+ I call to query sir its pro rata, again what???? I dont think was told it was a error and then oh no in fact it is pro rata so so I reversed the debit order and queried it. then started getting collection calls from another useless collections company called Hybrid collections, informed them numorouse times go back to Netstar get the account sorted and ill pay emails where sent and ive been told its been escalated.....no feedback then a Prelorna Pillay credit controller at Netstar emails me and says i've escalated its now 2 weeks later and NOTHING!!!!!! can someone at Netstar get off there behind and do there jobs, and sort this account out I wont pay until it is resolved. I am not paying for two months Pro Rata firstly and I agreed at R140 for the service per month SORT IT OUT! Would you prefer to spend amounts on collections and a client that refuses to pay due to account errors from NETSTAR or get this sorted so we can continue. Next step if this isn't resolved I will go to the competitions tribunal and NCR and REPORT Netstar and I will get the device removed from my vehicle and have it sent back to Netstars office and rather use a competent tracking company. SORT IT OUT!!!!!!!!!!!!!!!!!!