UNILAW and FNB

I have taken out a personal loan with FNB some time ago and due to personal constraints i was not able to make full payments. I was contacted by Unilaw to make payment arrangements which was going well for some time until they stopped debiting my account for no reason. I then contacted unilaw to find out what was going on and to bring my account up to date as my financial status was much better. I consented for the full amounts to be debited and did whatever was necessary to bring my account up to date and I was assured that they would resume with debiting my account. the following month i checked my statements and there was still no debits... i contacted them again and was promised they would rectify the debit and again still no debits . it's been almost 8 months and still no debits. all the contact details that unilaw had given me does not go through. I cannot get a hold of them... as a consumer I'm trying to do right by FNB but it seems they do not want their money.