Harassment from sigma

From last year I have had the worst service with sigma and it still continues.I have sent several emails to the customer service department advising due to covid the person. that assist me with payments of my payment arrangement has been retrenched and I will only be able to do a double payment next week the first week of February.I have been unemployed for 6 years.I am receiving threatening messages saying they are pursing legal action against me and phone calls at 21.00 pm in the night from sigma.I want a manager of sigma to reply and provide me with there email address.Do the consultants at sigma not read there emails??????I keep to my payment arrrnamhe plans it's only after the level 3 lockdown my assistance had a problem with funds.Every other financial institution rep**** to my email and made notes of the payment plan except sigma.I am not the only customer that has had enough of sigma and pathetic service and harassment.FOR the million time MY PHONE CAN'T RECEIVE CALLS II HAVE EMAIL ONLY I DONT HAVE THE MONEY TO REPAIR IT