Unreliable and useless

so I've been having issues since the beginning of the year with discovery I've been to the doc and doc called said a claim was not approved I then took my time and went to pay the doc cash however the manager I spoke to nandi that promised me a call back by yesterday pass 6 and I'm still waiting on her call none the less she was able to tell me no the claim was reversed but the doc got paid from my end and discovery so who's damn problem is that if you guys need to get paid create a charge on the doc and get the money I now have threatening letters about making payments got itc on my back and sms for arrest for a r304,80 I really thought this manager would pull through and get things sorted but it doesn't seem important I need to run up my phone bill and call like crazy to get things done deal with numerous agents that promise but nothing happens.Apparently i had to call the doc and get them to fone discovery which I did like a fool thinking everything sorted but no I even gave the manager the doc number and she said she would call.WHEN IS THIS GOING TO BE SORTED