Ipsos i-Say  -  NO response

Hi,
I have been participating in surveys for Ipsos Isay. Sometimes, I can complete the surveys but very often I cannot even get a chance to take the surveys. The message "Oops, this survey is no longer needed." For the past few days, I cannot even log into my own account to redeem my reward points. The message, "Denied access to this portal" appeared. I wrote to Ipsos Isay but did not get a reply.
Whenever I encounter a problem, I wrote to them and I get an answer. This is not the case for the past few days when I cannot even log into my own account. The message, "Your password and email address are invalid". I am very disappointed because I have been participating surveys. I have accumulated a certain amount and I want to redeem all my points. Why are they doing something illegal to me?