Poor service! App doesn't do what it's meant to!

I chose to skip my December payment of the MobiMoney loan, having two loans with Finchoice. They approved the skip, the app reflected no payment will be taken for December. Come the 24th, they debit my MobiMoney instead of 12 Month Flexi, and tell me I'm in arrears for the latter. I hadn't planned for that, it being festive time. Now I'm in a hectic situation. I choose to withdraw from the MobiMoney to cover extra expenses incurred because of this mess up on their end and after withdrawing it tells me the first installment is tomorrow, the 25th? Make it make sense, please Finchoice. How can I be debited twice in one month for the same thing? Please fix your app! The system does not seem to align at all, and being a loyal client I find this very inconvenient and offensive as I do not miss payments. This kind of treatment is absurd. Treat your clients better! Fix the app! This isn't fair, being such a busy time of year you can't even get anything resolved over these few days. We rely on good service to get by and this just isn't justifiable any way you look at it.