changed providers (no service) still getting spam

After no service from CellC in over 2 years of having 2 contracts with them, I was finally relieved when I could change service providers. I haven't been on CellC for over 2 months and yet they still send spam messages of the real deal to my number. Remove me from all of your mailing lists now please, I would not be stupid enough to sign a contract with CellC again as they never resolve any complaints - I found the way to resolve them myself, by canceling both of my contracts with CellC.