Disgusted with the level professionalism

I went to the Vodacom Centurion mall Shop to pay my cellphone account as usual and i was requested to pay a closing balance of 5rand and to my surprise no one in the shop notified me that i need to fill in the form to close the accounts, and to my surprise 7 months along the line i receive an sms stating that my account is in arrears, i have never even used the Vodacom number. Vodacom used to contact me on my MTN number even when i missed payment for 2 days. ALL OF A SUDDEN 7 MONTHS LATER VODACOM DECIDES TO COME TO ME AND SEND AN SMS THAT I AM OWING, why where they quiet all along?where they waiting for the money to accumulate so that they can charge me more , where is the level of professionalism ? is this how you treat clients ? why wasn't there communication being sent out to me a month after i payed or 2 months after ? why wait the whole 7 months to communicate? when we open accounts they request our private information like alternative cellphone numbers and emails but funny enough they dont know how to use those details. i am utterly disgusted with Vodacom and will never in future open any account whatsoever with them . i have tried calling them for a number of times without any help or luck , u get transferred to different departments and explain one story every time. now my credit record has to suffer for this and who must pay this R618 they want. i am really disappointed