When Good service goes Bad. RAIN Internet please sort out your client service.

I wanted to upgrade my Rain 4G Limited account to 4G Unlimited. I went onto their website and tried to upgrade. When I was my service stopped working. I contacted the service desk and I was informed that my SIM had been cancelled and I had to order another SIM with the 4G Unlimited upgrade. I was told this is the only way to resolve my problem as I was using it for business and needed to have access to the internet from home. The card arrived and I immediately noticed that when I am at home I get 2 bars maximum signal, but in the office I get full 4 bars signal strength. I contacted the service desk and I was informed that the tower in my area had problems and they had recently serviced it. I still have the same issue up until today! I have contacted them numerous times about this but no meaningful feedback ( only advised to stand close to a window for better signal). When I got my bill in March I was charged for 2 SIM cards, then again in April and in May. I had contacted them regarding the double billing in March and I was assured it would be corrected. I was billed for March, April and May and now they refuse to refund me. The billing department says it is a technical issue and the technical department says it is a Billing issue. I have been sent from pillar to post for 3 months and have had not meaningful feedback. They refuse to call me. Very bad service from a company that champions the people and has delivered a good service so far. I hope someone at their office reads this and resolves it ASAP as I am sure their are many more frustrated clients out their.