Wrong information captured - now I am listed for non-payment!!!!due to theis incompetence!!!!

I have taken out a contract in December 2017 from Telkom after they phoned me. I have given my correct FNB banking details to them for a debit order. Today I received an sms stating that I owe them R979.00 and must pay immediately. When trying to phone them I just get redirected to somebody else and I have to phone all the different numbers to try and get this issue sorted out! I want a copy of the recording when I took out the contract??? To verify that I have given the correct details as they have ABSA bank details and I don't even have an ABSA account!