Colinukuk Davidson

I have been away from the UK for over 20 years and i cashed in a small pension that was sitting doing nothing 63k GBP. I was taxed 27k GBP before being paid out the balance by the pension provider, i also received a P45 with tax code showing as 0T. I submitted a R43 form claiming this back but its over 3 months now and i have heard nothing. Should i have received this refund by now ?