It is a nightmare to close off my Jet account with RCS

The whole of last week I have been sending RSC emails to close my account and requesting a letter indicating that my account has been closed . Tuesday last week an RSC officials told me it would take 36 working days to close off my account. On Thursday another RCS official send me a paid up letter and I requested an account closure letter and was told will get it after the 11 September 2020. On Friday another RSC official send me an email and told me that I will get a letter after the 15th of September 2020. I then called RSC about the letter today another rude consultant who was chewing ffood over the phone told me I will get the letter after 31 working days. Rcs y don't u close my account? I don't owe you at all and I don't want this account anymore. Why is it so difficult for u to give me an account closure letter. I want this account closed. Should I involve Ombudsman in the whole process because ur consultants keeps on lying to me. What must I do?