Cannot terminate contract now for end Feb 2015

I tried calling Virgin since last weekend to give notice of termination of my contract that expires end February, but could not get through. My account was suspended due to non-payment on Monday/Tuesday and then I could not use the customer helpline nr \123\". Today I contacted them from a landline and actually got through. WOW! I then told the lady that I want to terminate my contract, because it expires end February,. She told me that she cannot terminate it, because I first have to pay. She also stated that I need to give 30 days' notice. I explained to her that I tried getting through to the help desk since last weekend to give notice of termination, but could not get through and that my phone was also blocked from phoning the \"123\" helpdesk nr. I requested her in any case that I want it terminated. I also stated that I am paying over the weekend. I request that my contract be terminated end February."