Hand over

Recently got a call from an ITC company, telling me that I owe lancet x amount and the debt has been there from May 2018 so I should call Lancet, called them and was advised that my madical aid did not approve the claim they sent, reason for that is because they submitted using incorrect details, so this consultant tells me he will Escalate for an amendment to be done then will forward to me so that I can send to my madical aid to pay them, that was in mid Feb 2019,25th Mar I call to do follow up as I keep on getting calls from this ITC company, then am told they are still awaiting for medical aid to pay,,, how so as the previous agent said it will be sent to me, I ask Pavin the agent I was speaking to that how can you guys just hand me over with out calling me after the madical aid declined the claim, you don't send me an sms or email or latter before you hand over during 2018 so that I can fix it then u just hand me over like that, he tells me no we did call you last year I asked to what number did you call and again he confirms an incorrect number, I asked him we just did security check begining of the call if you called the number you say you called then you would tell me that the number I have confirmed is incorrect so how come you guys called an in correct number, it's not the 1st time I did test with these guys so all of a sudden they submit a claim with incorrect details after so many years, pathetic service.