Intercare and their debt collection attorneys

My mother used Intercares dental department in January. Medical aid for some reason did not pay the full amount. I'm May (almost 6 months later with no communication about this account) they call to say there was an issue. When we asked for them to resubmit to medical aid they refused. Mind you we have gap cover that would've paid if we were notified in time. My mother being a pensioner did not have the funds and they handed the account over. The lawyers were so incredibly rude. We asked to make a payment arrangement and she wouldn't give us a straight answer telling us to pay the full amount (which has now doubled from the initial amount due to Intercare) and stop Making excuses. After trying to clarify with her about the payment arrangement she just hung up. I'm so disappointed in Intercare and highly disgusted at how their lawyers treat people. Never going back there again!