It is over twenty years since I last got in touch with them. A. I can’t help keeping getting in touch with them for over 20 years. B. I haven't gotten in touch with them for over 20 years.

I can’t help keeping getting in touch with them for over 20 years.

I haven't gotten in touch with them for over 20 years.

I used to get in touch with them for over 20 years.

I have been getting in touch with them for over 20 years.