Switching back to Income based ESA from Contributions based due to lower savings

Hi Everyone, I'm hoping for some advice. I was in receipt of old style Income Related ESA, and am in the support group. Due to receiving some money, my savings went over the £16000 limit. I wrote to the address on my claim and informed them, they switched me over to Contributions based, (I'm assuming this is still the old one) and said in the letter to inform them when my savings go below this limit. I will shortly be under the limit again, and will have to inform them so that I go back to the income based ESA. Is there any information on how this happens? Do I just write to the same office again to let them know? I am wondering whether they will make me claim for Univeral Credit instead. I don't really know what to do at this point. I'm sure I read somewhere that you have to be careful and do things in a certain order to get it right. Also I'm not sure at what point I write to them... For example , do I do it when I go just five pounds under? What then if my monthly payment takes me slightly over the amount again? I hope I've not rambled too much, and I would be really grateful for some advice. I also receive full PIP. Thanks in advance, Sj

Hi Gary, thanks for your reply. I am sorry I was a a bit hamfisted with my wording, indeed I was on CB and IR ESA, then ended up with some extra cash. I still get the CB part of ESA. I will try and get a hold of my Welfare Rights Team. THanks for your help.