Settling Arrears arrangement problems

I am disappointed with the service by Mobicred.

I had originally phoned last year to say I had lost my job. Subsequently, I did get a job and have been paying my monthly debit order. I tried to use my account this month but couldn't because of the arrears amount. I then phoned and confirmed it was the arrears stopping usage of the account. I then spoke to a consultant and I said I would pay the arrears at the end of February.

I subsequently received an SMS saying my account was being handover. Someone called me from somewhere with no idea which company is saying they are to collect my payment. I spoke to that person and explained that I had made a payment arrangement. Now I want to settle my arrears and phoned Mobicred. The lady (RJ) was extremely unhelpful and said that I must not make any payments to Mobicred and wait for the call from the handed-over company. Now I don't know how to settle my arrears. Can I make a payment to Mobicred and get my account out of arrears?