My TV tiles every 2 secs!!

Hello

i have been in my house for 7 years and I have never had a problem with my TV.  This past month my TV has tiled every day, every 2 seconds.  I have replaced my cable box and remote, the splitter and the HDMI.  All cables are tight.  I’ve called numerous times to no avail , they once said id get a credit for my trouble and it came thru as one dollar.  I’m beyond disappointed and frustrated and insulted.  I’ve been a customer for decades and this is what I spend $200 a month on.  It’s beyond upsetting.   I would like my service to work correctly or I’m changing cable companies. Thank you 

hollyb