Unresolved issue with vodacom

I have been having a problem with my bill with vodacom,I have paid with the app before the debit order date and now they have penalized me with R100.88 because the debit order didn't go through but I did paid just not with debit order so they can't help me because I paid before and i received a call telling me they will update it in 24 hours but still it hasn't been and I don't know if they still going to charge me because nothing has happen so far like I got promised..I don't know what to do because I did paid them..