im really angry because wonga doesnt give me a proper response

I am really unhappy with the service Wonga finance is giving me. my account was handed over to Wonga collections and I have agreed to make monthly payments of which that's what I have been doing up to now. I have been paying as per agreed arrangements. yesterday I received an SMS saying that my account is handed over to alliance debt collectors I was not even informed about this. I have tried to call Wonga and their collections department but their lines are not working. I believe I have a right to know what is happy with my account because I never refused to pay but I have been paying on a monthly basis based on arrangements. no one calls you or sends an email. its really a bad service that I found that my account has been handed over without knowing. its yesterday Alliance call center contacted me and I was able to make payment arrangements and that was successful. I agreed that I will pay on a monthly basis. the saddest news I received today is that I got an SMS from HTN attorneys saying that my Wonga account has been handed over to them. in this case I am now confused and really upset because I don't know which collections company do I make payment arrangements with. Alliance debt collection or HTN attorneys ? its really frustrating because I am running back and forth here. Wonga Collections department please let me know what's happening with my account because it not because I am refusing to pay , no! I do want to pay but with witch company should I make arrangements with because you are now confusing me. please respond urgently because I cannot get through to you. this not good service I believe I should be given the correct information.