Ba servise

I had a mobile contract with vodacom and i called to cancel it however i was advised that i should have called 30 days before, i did not have a problem with settling the outstanding amount and i settled the amount and i went to the carddlestone vodacom to get a settlement letter i was advised that they wont be able to issue one however they will log a call for me to get that letter. the call was closed without receivig the settklement letter and and i went to vodacom so that i can get a cellphone i was advised that the settlement is still hanging as my credit score rflects that i am still owing vodacom even though i have settled. Their customer service is very bad as no one is willing to assist and i have been making calls to get that letter till today my credit score is being affected because of this ussue.