Pip stopped and they Not answering the phone

Hey can anyone help me. I live in Bulgaria and get my pip paid to me out here. I found out, January I think that pip had sent me a award review form to fill in and return. I had had it and it so I rang them and after waiting half hour got through. They told me that one had been sent out to me in Nov, I told them that I had received nothing.. They said dont worry about it, its the post, this is happening, they gave me a date and I had to ring back to let them know if it had come. They said they would send another weeks went by and it did not come, and each time I rang I was given a further date to ring by and they said they had sent another, a few times it was answered by someone in a call centre in another country. A form finally arrived in March, I filled it in and sent it back 21st March 2023, then 2 more arrived. The last date was I had to ring them by was the 6th April 2023, but since I sent the forms back I have twice weekly been ringing PIP in England on 08001214433, trying to tell them its come, that I had filled it in and its been sent back. But what happens when I ring is, I am waiting on average 45 mins per phone call for the ringing phone to be picked up, only for it to go silent and then I am cut off. This happened every time I have rang, sometimes a few times a day, twice a week, since March. They have now stopped my money, I have received nothing the last 2 months now and I cannot get through to them to find out what is happening and to try get my money started again. I have written 2 letters to them at Personal Independence Payment ,Post Handling Site B, Wolverhampton, WV99 1AH, the 2nd today, but I am wary about sending letters from this post office, and I have heard nothing from the 1st letter, no letter, no email if they send them, and had no phone call. I have rang other pip numbers that I have found online and they are always answered after 1 or 2 rings but they are always only for people wanting to put a pip claim in. I dont know what to do, can someone help me.