*********** and lying consultant

This company hire *********** staff that deals with the accounts, One moment they deduct your money ,but 2 weeks later your account is overdue .You have to call them more than 5 times before your query is resolved.Worse part every time you send the query after few days,They send message that the query has been resolved,Now they have deducted my last installment ,but I still have the outstanding balance.Last month I asked question because I saw the balance was more than installment .I was told they will be the adjustment done after last installment. On Tuesday I realized I still have the outstanding balance I called them I was told the query will be resolved .Yesterday I received message that it has been resolved as they always do to make themselves looks like they are working.Today I called again I was transferred to three consultant which none of them knows what is going on.So I am not sure how is the issue going to be resolved.