conflicting advice regarding which class voluntary contributions to pay

Being a landlord is my main occupation and have no other income , Income for the last 2 years is £12000 annual gross.and before that 3 years at £10800 gross annual for this 5 year period my national insurance contribution need topping up according to the forcast , I need to know which class to pay to be intitled to full pension I was advised class 2 because of being classed as tier 3 and not registered self-employed although i do self assesment every year. government forcast says I need to pay class 3 and another adviser thought i should register self-employed . Could you please advise which is correct and how to proceed in paying .thankyou

Hi Alan b,
As a Landlord, you do not meet the criteria to pay Voluntary Class 2 National Insurance contributions.
Please contact the Future Pension Centre on 0800 731 0175 and they will advise you on the number of years you need to pay for a full State Pension, once you have this information you can contact HMRC National Insurance Helpline on 0300 200 3500 who will provide you with an 18-digit reference number and the bank details to pay Voluntary Class 3 National Insurance contributions.
If you still think you should be paying Class 2 National Insurance contributions as Self-employed, please call the National Insurance Helpline on 0300 200 3500 and they can take further information which will be used to make an informed decision on your status.
Thank you.