Ninfakamus G

Hello a few months ago I have also received a letter stating I underpaid tax I believe when I was a supply teacher. I have rang (45minutes) to talk to an agent and check the possibility to set a payment plan as currently I am caring full time for my husband. We spoke on the phone and was advice to hold on the line when suddenly the call was cut off!!!. As I mentioned I can’t afford to ring and be another 45 or more in the phone. When checking online on my tax acc. The overdue bill has simply disappeared and today I have received another letter asking me to make a full payment or else! I have been paying what I can afford online and still can’t find an effective way to reach out. It is quite frustrating