my suggestion would be to get a full refund for the three service calls that didn't work out and call another company. preferably not the lowest diagnostic charge you can find. good luck.
"When the people find they can vote themselves money,that will herald the end of the republic" - Benjamin Franklin
"Government is not reason, it is not eloquence, it is force;like fire, a troublesome servant and a fearful master. Never for a moment should it be left to irresponsible action"- George Washington