markhams ( tfg ) account paid but still beong harrased for payment

i went to pay my bill 2march at tygervalley. i made payment of 120 by card (twice) because of an error on there side and i paid 2200 wich i was refunded 120 from. so total payment made was 2320 which the cashier told me was outstanding. now im getting continious messages to pay my bill of 175 which doesnt make sense. i called the call centre 3 times and the agents keep dropping on me. i responded to a threatening email from tfg. still no response. i sent tfg a whats app still no response. so basically no one is assosting me akd im being threatended to pay my bills which already has been paid. i dont ever skip payments sometimes i pay a day or so late as i suffer frm a chronic illness which doesnt allow me to drive sometimes and have to wait til im better. your customer service in store. telephonically. via email and whats app is pathetic and let me down. at some point an advisor also just wanted me to confirm a day ima make payment and wasnt listening to me. my bill os pver r2000 everymonth and i make the payments. all i ask for that this is looled into and my bill gets waivered as i paid for this already. i trust that compensation will be in order aswell. contact me via email ***