poor service

poor service.i have been dealing with them since the middle of November 2020 to request a refund on over payments made.i have been pushed from person to person with nobody wanting to take responsibility to sort the problem out.i have made well over 80 calls and also have sent numerous emails even to there customer care and eventually got a call at end of December to say they will refund the 2 installments. I then checked the account and seen that that has refunded only 1 of the 2 installments. I then tried again to get ahold but nobody could assist once again.the refund was then reversed back into there account a week later and now I am back to square 1.i have email customer care aswell as senior management and to date have not even been contacted.this is pathetic service.