Mars customer and appreciate any input, advice or shared experiences here. I will try to keep this clear and round off figures but without identifying details if thats ok. All we received in January was a 2017 statemtent (first time getting this). January 2018 balance is 20k more than jan 2017 balance, reflecting unpaid interest. Monthly repayments due remained at 1500. The letters we received throughout 2017 showed the increasing balance every month with "including arrears" written in brackets. On a separate line it showed what the arrears were. (On the contrary, in 2016, our interest rate decreased a few times but the monthly repayment increased a bit). As background, I lost my job and have only made very small payments from time to time whilst also voluntarily putting house on the market. Aside from this we've had the usual problems others seem to have experienced...lost sales due to Mars inability to produce deeds; ignored correspondence; voluntary surrender rejected. Questions therefore are 1) have we been overcharged? 2) what can we do from here?