Refusal to refund me my credit and instalment/ pay me back

I settled my account with directaxis which my latest stammer with them confirms. They continued to debit my account and did not contact me soon as they got the settlement.

Now I am being sent from pillar to post and being told to wait 5 - 10 days and on the 5th day I’m asked questions which I had already answered. This is the first time they treat me like this and would not wish this experience on anyone. I owe other creditors which I would’ve paid with the instalment they took from me. They actually owe me more than the instalment even. This is not on!