Terrible service

Terrible experience i have had with FNB. I have been asking to cancel my account for more than 2 months and its just not happening. I settled a smart device 2 months ago and cancelled but they never actioned closing the accounts. I made a request again and i was advised that the accounts are now closed. Now yesterday they say they cant close my premier account because its linked to a smart device and i must settle but i already settled it 2 MONTHS AGO! Now im expected to wait another 3 days for an answer which i dont even have faith in. How exhausting!