2013 E-toll bill

After receiving an e-toll for 2013 I called Sanral and spoke to a consultant who couldn't assist me then I asked to speak to her superior she put me through to Kabelo Malika who also couldn't help I asked to speak to his superior he said she was in a meeting I said I would hold until she's done he the mysteriously managed to talk to her and promised to call me on Monday 25 March 2019, Kabelo's manager is Nkosingiphile Ngcobo. And I did mention to Kabelo that I won't receive a call on Monday and he kept promising me that his manager will definitely call me and as I have anticipated that call never came and won't come until I go to extremes to expose them. The e-toll bill was apparently R109 in 2013 December and now it's R273 and I'm receiving this bill for the first time in 6 years. I'm willing to pay but not the interest accumulated over the period I wasn't aware I had a bill to pay. Hopefully someone at Sanral will assist.