Covering expenses at my cost

I have an expired contract with vodacom today toy surprised I'm being call and told I have arrears I never received a returned debit order from my bank This lady tells me that they will charge me R 110 fir the unpaid debit order. To my surprised it went through. I checked my bank statement and the was more than enough. I can't even attach the statement here. This is your way to lower my credit score making me look like.a bad payer