Bad service from Woolworths

Woolworths has got to have the worst service I have ever come across, I had an issue with payment on my account and I gave them a valid reason and later forwarded the necessary document to advise them of this problem form my employer. I am still waiting even now, this happened in April documents were forwarded in end May beginning June. All I got was that someone would be in contact with me and during this whole time I have ive been paying my installment as of May and still, I get harassing SMSes and emails from Woolworths advising me I'm behind in payment. I am still waiting for Woolworths Financial Services to contact me and address the fact that their employees have not bothered to try to help me but to harras me by telling me what will happen if id not pay and yet I am paying.