I was with EE on a very good package for two mobiles plus a router. However the EE signal in and around my house is extremely low so we couldn't use our phones reliably and the mifi router was hopeless. I bought a posh expensive router which would work on the very low signal level here and put my phone sim card in it, and got a Tesco /O2 sim for my phone because the O2 signal here is good. It took me ages of complaining to EE that my signal strength is rubbish, when telling them exactly what strength it was, they obviously being non technical didnt understand but eventually I got the contract cancelled. They were persistent in insisting that there was a good signal strength at my house. Indeed there is a very good signal 30 meters down the road but my house must be in a black spot. Would they come out and confirm my measurement? No. Would they believe me? No. Their computerised network coverage area showed my house to have a good signal and that was good enough for them.
Same as all the fibre companies calling me and insisting that there is fibre outside my house. I told them I was installing fibre in 1996 and I know what fibre looks like and there is no fibre up the poles or in the ground outside my house. They just wouldn't believe me, their surveyor says there is. I told them to cancel the contract with their surveyor because they aren't doing their job. They must be sitting in Morrisons cafe all day scribbling colours on a local street map. So I said OK send your team to install the fibre and I will pay them. When they get here they will find no fibre and I will not pay them or you. Oh no, we won't send the installers until you set up a DD.