Homeloan Title Deed

My parents took a homeloan back in 70's of when it was still Perm bank. To date, in 2020 they have not received their title deed and Nedbank is claiming that they still owing 50 000. We started communication back in 2014 with Lerato Mohlabeng and she referd us to Selby Gumbi as he was the person dealing with Servcon matters. We were then referd to Vassily Baartman and went to meet with her at their Selby offices in 2017 and we gave her all the documents for payments,they have confirmed that the bond was settled by Servcon but needed to check and get back to us,that was in 2017. I have been sending emails to Vassily but she's not responding at all.My Dad has been struggling with this matter until he passed away in 2015,now my Mom is being harrassed by attorneys saying she must pay the amount or they will be repossessing the house. My Mom is now 70 yrs old and lives in fear of being taken out of the house,still no Title deed. This matter has been going on for more than 6 yrs and no one is assisting.Servcon confirmed they've paid Nedbank and settled the balance then Lerato also confirmed it was paid, when we were supposed to get the Title deed the attorneys representing the bank(mahommed arttoneys inc). I spoke to Dianna Dawes said no payment was made by Servcon that when we went back to the bank then they promised to settle the matter instead we got threats despite the several meetings we had with the bank on numerous occasions.All we need is a Title deed.