You can apply for Guarantee Pension Credit before you reach State Pension age but it will not be put in payment. I usually phone GPC when I apply for clients, new claim 0800 917 2222, they usually do a preliminary check then transfer you to another department for the actual claim.
I have heard that there was a bit of a backlog as staff were moved to help with the backlog of PIP and WCA applications.
You will have to contact GPC to find out about your claim.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems