FNB has the worst service ever don't bank with them

FNB is the worst bank, I have a personal loan with them that I took in November for 6 months, I made advance payments to them thinking my loan would finish quicker but instead they deducted twice my installment and the second deduction was was by almost double. I've been calling them and getting transferred from pillar to post using my airtime for sometimes 45min holding. I lodged a complaint and was asurred by a consultant in the complaints dept on Tuesday 4th June 2019 that I would be refunded within 48hrs. Come today Friday 07 June 2019 nothing, I called today and instead of telling me that they gona resolve it the collections dept tell me they still going to investigate, this now after I was assured of 48hrs and me having to call instead of them getting back to me. On 2 occasions I asked to speak to their team leaders to get a resolution but on the first they told me they in meetings and will get back to me, nothing. Now today I was told the team leader is on another call and that was about an hour ago still no call. I keep using my airtime and have to start the whole story again every time I call even though I give them a reference. The service sucks and I feel they are taking advantage of their clients. I have a cheque account, investment and a loan with them, they clearly have benefited from my accounts and they can't even provide good service. This is not the only platform that I want to expose FNB, I have recording on my phone for all the conversations and bad service that will go on my social media as well as tell everyone I know and also going to the CPA Ombuds as well as the credit Ombuds. I will make as loud a noise as I can till they decide to treat this query with the urgency they should've, even after exhausting their complaints procedure. Maybe they will start treating their customers of color the way they should. My reference for my complaint is ********** for any FNB social media staff that will see this and maybe they will start treating their customers fairly because they have clearly shown that as long as they benefit from u to hell with fairness.